I prefer VS on the red eyes. I like the beds, even on the 330/340/787s, particularly my head away from the aisle for privacy and the additional shoulder room in bed mode. The “flip over” is a little annoying, but gives you a good “solid” sleep surface.
Daytime westbound, I much prefer DL. The VS 330/340/787 Seats are tight in the shoulders, have minimal recline as others have mentioned, and have very little space for “stuff.” I’d take a DL 767 over VS on a daytime flight, but would prefer VS on a red eye.
Earlier this year I was “forced” to do LHR-JFK on VS (it was a VS-only fare that included BA segments), and the catering was kind of disappointing (including the selection). That said, on a more recent JFK-LHR flight I was quite surprised by the extent of the menu offerings on the short red eye, including lots of savory snack items. Of course I had eaten in the clubhouse and so didn’t eat anything on board, but it was certainly a better-looking menu than my previous westbound.