I would personally prefer a electoral system which favors ranked choice voting, so personally it's a matter of how many boxes they check for me. If you want my personal opinion as to who you might like, maybe Mike gravel, or a social Democrat(closest thing) like warren would be a good middle ground. The only democratic socialists running would be Sanders and gravel. There are 3 social Democrats(4 if you include Sanders), which are Andrew Yang, Elizabeth Warren and maybe Tulsi Gabbard.
I think Warren is the safest candidate to vote for. Less contentious than Sanders, with very similar platform.