Robert Trujillo was a member of Suicidal Tendencies. He was also a member of Ozzy's band after the end of the Zakk Wylde era and joined Zakk in BLS.

None of the bands he was in were better than either Metallica or Megadeth and it should also be noted that his ENTIRE CAREER is made up of joining established, successful bands after they've had a big shakeup. He's a hired gun and not really anything special.

EDIT: I almost forgot - Trujillo played bass for Ozzy on the 2011 re-issues of "Blizzard" and "Diary" so that Ozzy could avoid paying royalties to Bob Daisley and Lee Kerslake.

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Metallica has entire albums that I listen to. Megadeath has songs.

And Master of Puppets was their pinnacle.

I really dug Death Magnetic.

I wouldn't say that they're better than Metallica or Megadeath, but the thrash metal band I like listening to the most when the mood strikes is Exodus, the band Kirk Hammett left when he joined Metallica.

Great band.

The greatest thrash lp of all time is Beowulfs self titled lp.

Agnostic fronts victim in pain is a close second.

Cro mags age of quarrel at #3

Remastering has destroyed the early thrash metal sound.

commercial success does not factor in what makes a band better or worse in this style of music.

Still doesn't take away from the fact that he's a dipshit.

Newstead was better.

Don't forget the side-project Infectious Grooves! Myself, I'm more of a Suicidal fan than either Megadeth or Metallica. I was more of a skater thrash guy. Suicidal and D.R.I. were big for me in the day and I'd still rather listen to them over the other two. For that matter I was a bigger fan of Anthrax and Testament than them as well. Don't get me wrong, Rust in Peace is a classic and Peace Sells has some good stuff, but with the exception of the Black album, I think the most disappointing album ever for me was Countdown to Extinction. How you go from Holy Wars to Sweating Bullets and Symphony of Destruction, I'll never understand.

As far as Metallica goes, sure I liked them, when I was 13. Kill 'em All is the only album I can still listen to these days. Unfortunately, as I got older and became more of a musician myself, I came to realize that there might not be any more overrated musicians on the planet than Kirk and Lars. Well, maybe Flea, but that's an argument for another day.

Black Album > Countdown to Extinction

Tell me one Newsted song where you ever thought, "Damn, that's some good bass playing!" Hell, he was completely mixed out of ...And Justice. I'm not saying Trujillo is a great player, but Newsted was a just a warm body. He contributed nothing.

Trujillo is a great bass player and Newsted didn't stand a chance because he followed Cliff, (and thus was mixed out of practically every tune).
Bowser's question was a good hypothetical until Pest shit all over it by calling Trujillo a dipshit for no reason.
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I know....**** my opinion....right?