Depends on weightclass. But brushless drives are finicky beasts. Gearratio is much more important than with brushed motors.

In our raptor we use SimonK programmed Afro 30's for drive. Drive itself is a set of Neptunes coupled with 28mm 2840KV diameter inrunners

In Hannibalito 5 we have, again, a set of Neptunes, but coupled with a pair of 1500KV 3650 inrunners and SimonK TZ85A's.

One heavy I know off uses 100mm diameter brushless outrunners and MGM Compro ESC's. (think big ££££)

Bananaking, a Russian monster, uses Revolt outrunners , but the Alienpower ESC's they tried burned out. VESC's had more succes, but can't get the power the machine needs. (one of the reasons I'm following the 300A VESC thread)