SRi and SXi are trim levels for the Vauxhall Corsa – both designed to have sporty looks to mark them out from lesser versions. SXi was discontinued in 2015 and has not been offered on the fifth or sixth-generation cars released since then.
SRi gets sportier looks than the standard Corsa, with cars from 2020 onwards featuring a cool contrast-colour black roof. SRi trim is often bundled with a 'Premium' or 'Nav' package that adds extra interior goodies along with larger alloy wheels. SRi isn't available with the entry-level engine either, so you end up with a little more power under the bonnet to match the sporty looks.
When it was available, SXi trim came with the visual upgrades of SRi models including the larger alloys and sharper styling, but kept the more affordable entry-level engines. This version was more about the 'show' than the 'go'.