[Vivo X90 Pro Plus] extremecarver:
If you lucky there will be some review of the X90 Pro with comparison to S23U in english. You can hope for some Chinese reviews but even in China the X90 Pro+ is not that popular - there will be much more comparisons with Xiaomi 13 Pro.

It's rare that chinese only phones will be reviewed by quality review websites like notebookcheck or gsmarena. Though a review of the X90 Pro is quite likely after the huge advertisement campaign by Vivo and expensive laucnh events... Europe and US are not that likely to feature big events however with the Nokia vs BBK copyright claims. Something strangely rarely mentioned here.

Better battery life is clearly Samsung - many users reporting 10h Dot even on 4G/5G Data. Unherd of for X90 Pro+ (maybe X90 and X90 Pro could get close - they have much better idle drain/battery life).

Price in Europe is definitely in favour of S23U - which sells for 1169 for the 512GB version with warranty, with update policy that will end in 5 years not maybe in 2 years (older Vivo flagships X flagships - only the Funtouch X versions have 3 major updates promised and updates are already running late - no January securiy patch for X90 Pro+ even on trial channel). Yeah no charger but any PD charger works full speed, vs 18w on X90 Pro+.

It's too early to call out the cameras - I feel both aren't top. But Samsung bags Video easily and over 10x zoom. Vivo will likely win 3.5-9x zoom range.

Gorilla Glas Victus 2 vs unknown (likely Schott)

Bootloader Unlock/Root and after updates are over in 5 years likely Lineage OS and others to continue vs crippled software.

Accessibiltiy to Samsung shops for battery replacement in 2-3 years of time - vs unlikely to be able to get any authentic new batteries for the X90 Pro+ outside of China (and looking at the reports on here on older Vivo phones - batteries don't seem to age very well on Vivo flagships)

Android Backup/Auto/Assistant/Maps Timeline and maybe in future more (this list got bigger every 2 years)

The only points that clearly speak vor Vivo are the fingerprint reader and yeah I personally prefer the design too on the Vivo. Though I don't know how well the Vegan leather ages. Some conflicting reports here. And yeah fast charging on original charger with original cable (missing either means slower than Samsung)

Display is identical, processor mainly just a newer batch (but that means lower voltages in general)

Front Camera goes Samsung all the way. Vivo has a midtier phone grade front camera and only 1080P video on the front camera as the sensor does not support 4K/UHD (1440P woudl be possible by third party apps - but none offers that yet. The sensor does support it).

I feel v2 is a joke - seeing that I mainly use Gcam (which cannot use the v2 chip). 8gen2 ISP would be sufficient as I don't see what the v2 brings at all.

Both have much worse colours than Pixel/Iphone in my opinion. Both show great detail at night but that isn't everything. Both have big shutter lag but Samsung at least got the autofocus right (on all cameras and not missing on 2 out of 5) and the autofocus working accurately (while that is not true for the main sensor on Vivo).

Yeah portrait may be better on Vivo 2x camera - but ONLY for typical upper body portrait. If you do full body portrait with the body at 2/3 of the picture size or less - the 2x sensor without autofocus isn't very sharp anymore. Falling back to main sensor is not possible in portrait mode on the Vivo stock camera...

Vivo X90 Pro+ only has Qualcom Fastconnect 6900 vs 7800 on the S23u (meaning no wifi-7, maybe not even wifi-6e, so far no one could confirm it to work! and missing the newest bluetooth LE additions)

S23U got Qualcom X70 modem - unsure what Vivo uses (either botched firmware on X70 or is it x65 or is it a chinese modem?)

Software in general is miles better on Samsung and less buggy. Yeah Vivo is fluid but Samsung too.

I much rather trust Samsung to fix the software deficiencies it has (mainly on camera - everything else seams great) vs Vivo (which has many many fields to catch up - and some like anything google related will not improve except google goes back on offering full support for it's app that aren't system apps. However with EU/USA and so on pressuring google to allow manufacturers to supply phones without google apps as system apps, that strategy will likely widen in future - as it's an indirect pressure point to include maps, assistant and so on as system app - which is impossible for Chinese market phones if China doesn't allow google which is highly unlikely in the next years).

The 2x sensor on the Vivo would be useless if the 1x sensor had variable aperture (because the 2x sensor has only bokeeh that speaks for it, low light/resolution/autofocus and basically everything else are worse vs a crop from the main)

The case on the x90 is a nice plus, but I don't trust cases without air cushion and camera protection - so I don't really see the use for it. If you feel safe enough with that tiny case - you should feel safe enough without any case.

Gcam support will be much better on S23U as there will surely be nice profiles for color/noise while on X90 Pro+ you are left with dubious colours at night on gcams.

If the X90 Pro+ had bootloader unlock and root - some issures would be fixable (like google apps) and if lucky once Vivo stops updates there could be some Lineage OS support. Vivo that way kinda steels the only way for long term life of that phone.