The best local cinema in this part of London is an independent, Brentford Watermans. It's comfortable, has a good selection of art house and mainstream films, good sound and picture, and has a proper bar and even a curry house on the premises!
The national chains are far less appealing but you have to use them if you want to see big films as soon as they're released. Vue are the lesser of the big two evils as they have "stadium" seating and decent leg room, but they seem to employ the minimum number of staff so queues are long, and they start clearing up the popcorn as soon as the end titles start rolling. The toilets in the ShepherRAB Bush one are always out of order so there are always queues.
Odeon: avoid. Soulless places, designed to look cool but with no atmosphere, often bad sightlines so you get a stiff neck, and the world's worst web site.
UGC: curious. Their head office is in Chiswick. There are no cinemas in Chiswick. The local branch is in Hammersmith, an old ex-ABC (probably many previous owners) which is reputed to have a large rodent population. They are planning to knock it down and build a big Tesco on the site, to add to the six Tescos within a mile of each other in West London. And not to replace the cinema.
Indies definitely win.