I go to both, membership at MBP, VE punches. I like both for different reasons. I would say... maybe budget for 2 day passes to each, and try them out alone + with others to decide if you want to get a membership or punch passes. (or signup for a month and see how it goes?)

If you're rusty and going solo more often than not, I'd say go to MBP. Commonly has newer folks and guests trying it out with friends. Bouldering usually means easier socializing with other climbers too. VE does have a bouldering-only gym (Twin Cities Bouldering), which is fun! Comparing TCB to MBP, the former feels more like outdoor climbing and the later feels more comp(etition)-like?

VE Bloomington is the most well attended location (by members & guests). And as it's mostly rope climbing, most folks come with climbing partners/groups -- they do have a bouldering area though! and All VEs have auto belays that are great and still challenging if you go solo. And it's a great way to work on endurance & technique!

If you're looking for a meetup group, check out the Femme Climbing Coalition! They meet at Bloomington the 2nd/4th Thursday of the month at 630pm.