I personally would book the direct A380 LAX service, indeed in my forward bookings I am organising meetings in LA/NYC/WAS so that I can fly there on my way to LAS. If I have no reason to have an intermediate stopover on the way to LAS I used to take the BA275, because of the poor T5-T3 premium transfer experience I've now looked at alternative carriers and have booked VS direct from MAN for a trip early spring.

I will not transfer T5-T3 any longer until the First Class ground experience is truly a First Class transfer experience.