I think this is pointless because they both wish they were Tony Levin.
Tony Levin is hands down the best bass player I have ever seen. It is not even close. I have seen Les in many different groups he is great. Oysterhead was pretty forking amazing. Was not close to Levin with king crimson.
The first time I saw flea was at Jimmy's and saw him many times. Fun yes I never thought the greats ever.
That 80s version of king crimson by far my fav.
It was physically exhausting to try and keep up with what was going on on stage.
OMG bill bruford and Tony levin on the same stage was a dream. Belew and fripp what more can you say.
In fact the second time I saw them I stayed sober so I could pay better attention.
How about Getty Lee and Les Claypool on the same stage?
Claypool and Sean Lennon had a band called Delirium. Getty played with them for a short minute. In the link below they do Tomorrow Never Knows. At one point, about the 9:20 mark, Claypool is doing a solo and Getty fades into the background. Then Claypool just stops and the bass line continues in perfect synch as Getty steps into the spotlight continuing to play Claypool's solo. Cool stuff and great bass work by 2 of the best.
So, when you talk bass I think you have to put Lee and Entwistle into the conversation along with folks like Claypool (my opinion, he's the best) and Levin. But Flea? Fun, good, but not a great, imo.
And if anyone has an interest in the history of the bass instrument, check out Getty Lee's book "Big Beautiful Book of Bass".
And one more before the link:
Lets put Carol Kaye into the conversation. Known primarily for her work in The Wrecking Crew, she was the ultimate professional. You may not know who she is, but you've heard her thousands of times on hit records from the '60s & '70s. A lot of famous bass lines from those records were her invention.