Best: between TPE 185 (classy if a bit Eastern European/Soviet-esque colour scheme) and the ScotRail Inverness 158 (Grammer's finest in a good layout with a nice, soft colour scheme).
Honourable mentions to:
- Merseyrail 507/508 and SWT PEP/455 refurbs, both made a quite old train look new - better on the PEPs because they're a timeless design whereas the 455 looks very dated to the 1980s due to the interior fittings like the luggage rack. GWR 150s similar.
- Brighton Express 319s - not fancy, but excellent legroom by not cramming in those pointless side-facing seats at the end of the section
- All First North Western era refurbs which got the decent Chapman seating and the large luggage and bike racks
Worst: anything with Richmond seating, it's awful, the bases collapse and tilt forwards giving no underthigh support after about a year.
Dishonourable mentions to:
- 153s with ex-158 seating installed so even the tallest people can't see out of the window (that was Wales and West, I think)
- GNER for using single-piece cushions on the Mallard refurb and thus creating the same problem as the Richmonds, though VTEC later fixed this by swapping the cushion to a softer, two-piece one, there was nothing wrong with the frames per-se