This is a hard one, because you really would have to compare like models to like models and similar years. For example, Bayliner built some top notch motor yachts in the day and there was a time that Glastron was considered a top of the line runabout.
From the list we have owned SeaRay, Cobalt and Glastron (this was really too old to consider for today). I was very happy with both my SeaRays and really when looking at a new boat a couple of years ago it was a race between a 240 Sundeck and an R5 - I found the R5 first. After owning it I do think my cobalt is a better boat than a SeaRay of the same vintage, it doesn't edge out the SeaRay by much, but here are some the details that I found:
The differences:
-The R5 has a better ride than the SeaRay, planes faster without trim tabs and is very quiet - no rattles or squeaks.
-The stripes on a Cobalt are gelcoat, no stickers,
-All of the hinges, fittings etc are stainless and very heavy. I have yet to find a loose screw or fitting on mine. The bimini for example, is just beefy - it does not shake or rattle at all, uses adjustable SS poles to keep tight, no straps or snaps.
- Other touches like a SS rail around the swim platform, looks nice and protects the platform. Hinges that hold the swimstep are also very beefy.
-Windshield frame is SS not aluminum.
-Styling - I don't care as much for the new SeaRay styling, I think Cobalt has a more classic look.
-The upholstery and interior finish work, I just like better, the dash coverings and rolled upholstery with accented stitching seem high quality - but maybe that's just personal opinion.
Thinks that are about equal:
-Engine packages - Mercury/Volvo, eh, one is red one is black, I have had both and like both.
-Rigging (engine room, wiring, accessories, etc) again I don't see much difference.
-Performance - other than the fast, flat planing that I mentioned above.
I can't really comment much past the boats I have owned, but I will say:
These are not ranked in any particular order, but grouped by what I would consider really good boats and not so good boats.
Formula - Well built, Emron paint, dated styling, engine options other than just Merc/Volvo
Cobalt (I do own one) - Solid build, classic styling, upscale interior. No stickers! Merc/Volvo and soon Monsoon engine options.
Regal - Solid build, upscale interior finishes, No Stickers! Merc/Volvo engines
SeaRay - Solid build, nice interior - I still like SeaRays, the newer styling is growing on me. Getting rid of stickers, but some are still there!
Chaparral - Nice looking boats, new styling is better I think, never been on one enough to comment much more.
I really don't know enough about any of these to comment.
Four Winns
Crownline
Glastron
Bayliner