I agree with the consensus that you'll like the 744
and not necessarily be thrilled with the 762.

re individual claims by UA:

*Hot, scented refresher towels during flight and at
the end of the flight

Yes, almost always

*Separate airport check-in line(s)

Yes, but they may be surprisingly crowded

*Access to United's Red Carpet Club

I don't think so - for nonmembers, you get in
only on international flights; you could make
a case for getting in if you could somehow
convince the concierge that you were promised.

*Early boarding

Yes

*Pre-departure beverage service of champagne and
orange juice

Usually

*Option of three entrees on all flights, served
on fine porcelain.

The porcelain is okay.

*Premium wines, choice of fruit and cheese or dessert
with port and liqueurs, Starbucks coffee, and Godiva
chocolates

Not with breakfast. Wines will be available for the
asking: the Kinderwood wines they've been pouring
have been variable even within type - one of the worst
Cabs I ever tasted last week, but that was one out of
four tries, the others okay

*Fully adjustable, ergonomic seats complete with
Backcycler(R)

Probably: but a chance that they'll be broken on the
762. On BOS-SFO recently I found two broken seats.

*lumbar support designed to provide more room to work,
relax, or sleep. Chairs also include leg rest, foot rest,
and adjustable head rest

Some of these features may not be available on the 762

*Complimentary in-flight amenity kit containing travel
necessities such as eye shades, a toothbrush, and more

Definitely not within the US

*Personal TV's on each seat that are stored in the
armrest's

Don't remember: probably not on the 762 except in first

*Priority deplaning and priority baggage delivery at
the final destination

Maybe and maybe

Also, what is a Buisness Class breakfast and Snack
(what does it consist of).

Fruit plate with cereal or yogurt - generous serving of
fruit of variable quality (sometimes fine)

Possibly the breakfast sampler - quite variable, usually
not too good but I've been surprised

Possibly pancakes (gunky)

If you're lucky there may be an omelette choice;
if you're really lucky it may be good, although the
last one I had was gigantic (3 eggs at least) and
completely tasteless, but it was catered out of MEL.

Breads variable depending on the local supplier -
I've had some quite good croissants on occasion.

Coffee from Starbuck's, if you like that sort of
thing; tea murky and indifferent; frappuccino on
request.

Orange juice last I checked was Minute Maid.

I hope your flights are good ones.