For me I'll choose short term investment cause I'm not a patient man so I just want to invest in any cryptocurrency for few days or maybe a month maximum and I think short term investment is better than long term investment cause you can get profit everyday or maybe every month but with long term investment you need to hold your cryptocurrency for years.
I think Investment should be done as long term. Investment is usually done to make sure that when you need the money in the future, you can have something you can sell or you can get money. So in conclusion if you're going to invest, it should be long term.