Steel is springier (and real) but carbon lighter obviously.
check out Salsa and Surly for quality steel or Carbon Cycles for value for money carbon.
Bladed carbon looks neater but not essential.
I’m currently running a Van Nicholas VNT on my Sherpa 29er but use a Surly Krampus 110 when using 27.5+ wheels.
Avoid the cheap Chinese carbon on eBay,