[HTC Sensation] BarryH_GEG:
OK, here's my story. I was one of the first to get a G2X on 4/19. Let's just say LG would be better off sticking with TVs. I have until 5/19 to return it to T-Mobile for a refund. It's replacement was going to be either the Sensation or SGS2. I went for the SGS2 and here's my thinking:

SGS2+

- International phone not burdened by carrier crapware and not neutered in any way software or hardware wise (some of T-Mobile's proprietary apps were responsible for the problems on the G2X).

- 21MB HSPA+ on AT&T vs 14.4 on T-Mobile.

- The screen, even though I think a higher resolution would have been more appropriate for a "flagship" phone.

- Updates from Samsung directly

- The best MS Exchange support out there (it syncs tasks, uses the company directory, and checks busy status!).

- Better tech specs (CPU/GPU)

- Better camera (still and video)

- Better sound (at least for now it appears that way)

- A true, unbridled quad-band world phone.

SGS2-

- I'm dependent on Samsung vs. my carrier for hardware support.

- The thinness, lightness and plastics make the phone look toyish.

- The screen (SA+ is an advantage, the resolution a minus).

- No accessories in the U.S. (Ouch when you take in to account currency and shipping).

- Samsung really f-d up the Android migrations on their phones and the original S' GPS problems are legend. (I'm hoping they learned their lesson and having a non-carrier phone makes updates easier).

- Price (we early U.S. adopters are making the British rich)

Sensation+

- I had a TouchPro2, HD2 and G2 and love the solidity of an HTC phone.

- Better screen resolution.

- New Sense (theoretical because only the "pretty" has been reviewed; not the integration and day-to-day functions).

- T-Mobile warranty and extended warranty.

- LED notifications (why oh why are carriers leaving this out).

- HTC's track record on updates (OS and functions) is much better than Samsung.

- How can you not like $199 out-the-door?

Sensation-

- 14.4MB HSPA+ (Are T-Mobile and HTC kidding?)

- The phone looks like a bigger and clunkier version of every other HTC phone and I'm not a fan of the multi-color back.

- Jury's out on the CPU/GPU but early benchmarks aren't promising

- Camera and sound (I'd be surprised if this doesn't end up being one of the biggest comparative issues)

- T-Mobile's in trouble (their attrition rate was worse than the worst projected by analysts).

- AWS is going to go bye-bye post-merger leaving a really nice phone homeless.

So there you have it. There's important things that none of know until some real-world usage takes place. Things like signal, connectivity interoperability, Bluetooth and Wi-Fi performance, etc. Both Samsung and HTC have a lot of experience in those areas so I don't think either one will fall on their face but I guarantee you you'll see the first page of each respective forum riddled with problems and complaints.

I do have to say that, design wise, both phones are pretty much failures considering what they represent - an evolution in smartphone technology. The HTC's fat and derivative while the Samsung looks and feels like a cheap TV remote. I'm getting the SGS2 the Case-Mate heavy case when it comes out which should add a little heft and substance to the phone.

Good luck with each of your own respective decisions ;)

P.S. - I hope none of you really put the O2X/G2X in the same class as either the Sensation or SGS2. All of the reviews/coverage of both that mention the O2X/G2X refer to it as "not a bad first try" as a next generation phone. Samsung vs. HTC is a legitimate conversation. Based on my experience, LG's got a lot of catching up to do before they can join the party.