Phil has been pretty consistent over the years with the core of his touring musicians, the bigger changes typically being around the horn section and backing vocalists. The one time he did mix it up was when touring Both Sides; out went Chester and Leland Sklar, in came Ricky Lawson and Nathan East.
I'm guessing there will be more love for Chester than Ricky, given the former's long history with Genesis, but I'd be interested to know either who people felt was the better bassist or who they just prefer between Lee and Nathan.
As a former bassist of no real talent, I have no particular insight into their respective skills and love and admire both of them as bassists and, from what little I know of them, as people. If I had to pick one I'd go for....probably.....Nathan East. I've long been a fan of Eric Clapton and have seen a lot more of him, but then I've probably heard more of Lee, without even knowing it, given the thousands of sessions he's worked on.
More than happy for this thread to extend into Brad Cole or Peter Robinson too if anyone has a strong opinion on that...I'd go Brad!
(Total respect to Mo Foster and Nic Collins too, just went with those he's toured with more than once.)