magento is certainly much more robust and therefore it consumes more resources, you need a hosting to manage the hosting, maybe with nginx, redis to get a good performance.
The two do ecommerce work, the issue is robust and business size. vlw
I don't think it's worth trying this theme for magento 2, this theme hasn't been supported for a while and in the last version that says it's compatible with magento 2.3 it's having some problems
I'm a newbie, but from the experience I had, for you to start the reactions you need at least 11 nullcash, how do you get this? Making your posts! Basically that, of course following the rules of the forum!