it's going to have to be the pacers and voyagers for me!
I always try to avoid voyagers at all cost!
Voyagers are fine when they're not overcrowded but very cramped when they're overcrowded.
Even though it takes me an extra hour to travel north from Southampton, I always avoid the through Bournemouth-Manchesters between Oxford and Birmingham, either by jumping ship to a Reading starter or putting up with it until Banbury and getting a Chiltern. The ones which start/terminate at Reading, however, are much better.
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I'm going to be controversial - Pacers aren't part of my day-to-day railway, so when I do get one it's a bit of a novelty to me. So I don't hate them.
I'd go along with that. They've now got to the stage of their life where they have the "novelty with age" factor and they look different to everything else on the railway.
TOCs which have a random mixture of Pacers, 150s, 153s, 156s, 158s and 170s all working in multiple gives interesting variety.
But as a caveat, I don't rely on pacers for regular travel - or indeed any travel these days - so probably not qualified to say much about them. There are probably various classes of DB EMU I have used more in the last 10 years. Indeed, I can't remember when I last used a Pacer. Possibly between Manchester and Edale circa 2000, not long after that route was a mix of Pacers and 101s!
Answering the original question, probably Pendolinos and Voyagers are the most cramped, though both are fine when they're not too crowded. Best contemporary units that I regularly use are probably 444s, 350s and 158s. CIGs were great in their day but best not go there
