Some may consider them similar, but I see them quite differently.
Chet came up in West Coast school, and didn’t deviate from that style. Maybe if he lived longer he might have. Plus his popularity as a singer certainly differentiates him.
Miles began in be-bop with Parker and Gillespie, then moved on to cool and then modal, before exploring electronics and fusion. So much wider ranging stylistically. And for obvious reasons never became a singer. ;^) Also Miles lead most of his groups while Chet was a partner.
I really appreciate both for their respective talents and paths (minus the drug impacts). So they are both in my favorites list.