Talk to house plants just so I know how smart they are. I mean they could help make upkeep easy obviously, more water, not on the leaves etc. But what else. Philosopher houseplants! That would be so cool
Houseplants, easy. They're my favorite interior decoration anyway, now they're upgraded to little buddies I can chat up and bounce ideas off of? Yes please.
I already can talk to house plants. They never say anything back though. I would still choose it as my super power though because of be afraid of accidental emissions.
Assuming that harmless means the glitter is biodegradable and actually causes no harm, I'd take the glitter.
I've got a young kid and several young nieces and nephews. Most of them are either going through the sparkly princess stage, or their superhero phase. Being able to puff out glitter on demand would make their days :)
Talking to house plants could be turned into a new life as a spy or PI (albeit a very niche one). I don't imagine plants would be super talkative so it probably wouldn't get too annoying. Glitter finger farting doesn't have any uses I can think of besides pranks and crafts. So I'll go plants.
Talk to houseplants. That would be a fascinating conversation, even if they don't care about the same things as us. Does it work on non-house plants, too? Imagine the hot goss old trees would have...
Hmm i would say house plants because i could maximize the output by providing better lighting, the right amount of water, perfect temperature and nutrition without fancy equipment. Yes i grow weed. However i would need someone else to do the harvesting as it would be rather horrifying to do so myself.