tl; dr: if you don't want to see seas of ads, awards are the better choice, in my opinion.
honestly, i would be fine with it. I'm not entirely sure what's the big philosophical deal, donations are harder to get, and I'm not so sure as many people are going to voluntarily go and visit the donations page. on the other hand, if the award option is immediately there within the post, one is much more likely to give it. lemmy can simply not sustain itself on the long run solely on donations, especially considering the mass of media content that may be posted. instances can run on them for now. i would prefer them running on dumb awards than on ads instead, and the mole of ads required to make up for the money needed could be really high we'd get reddit level advertisement. hell nah. also, it incentivizes the user on posting quality content if they see the chance of shiny lemming medals, maybe.