Once you are tall enough, there becomes just one single measure as to whether a train is ok ... which is whether your knees fit in. Ride, comfort, windows - all mean nothing if you feel like a knife is stuck into your knee for an hour, or your contortions give you a bad back for the rest of the day.
I'm just too tall to fit in 170 airline seats comfortably, but only just. Bays are good, with a little footsie, but all other airlines are a no-go. A 158 bay is only ok once it has had the new skinny seat cushions fitted. 156, 155, 153 can be really awkward, and come with few bays anyway. Same with all the pacers.
Special hatred goes to the 150s, where one memorable journey had my knee less than 2" from someone's crotch. Oh, the warmth I could feel! And it was rather uncomfortable staying tense all journey, hoping that the driver didn't brake sharply.
One day I'll try the 195, but they're said to be ok on legroom, so likely already have my vote.
It *is* tedious having this single measure. It limits my options on boarding a train immediately (except an Azuma, or kin), and I have to take a single-minded aim at particular seats, and rush. Unfair, I know, but I can get annoyed at short people who have chosen bay seats!