Hi- welcome back!
I agree there is now a massive selection to choose from in the lifejacket market.
I have just bought 3 for my new boat, and here's the reasons I considered:
I wanted all 3 the same - picture the scenario - you are sinking and hand out jackets to your crew, you have 3 jackets 2 good ones and a cheaper brand - who do you give the cheap one to????
I bought 3 good quality jackets - hurt the pocket, but can you put a price on safety - especially when the difference between a cheaper brand and a decent auto inflate may only be 15-20 quid.
I went for auto inflate jackets - if you are knocked unconscious and go in the wet stuff, the jacket does all the work.
Most of the jackets you see advertised are decent, mine are XM models, cant vouch for the others as havent tried them. I can reccommend these, they also have a heavy duty S/S lifting ring on the buckle if the RNLI need to use it. I paid