For me:
- Very low fee
- Fast speed.
If I want to invest on a coin I will looks for their price chart over history if their is more upwars than downwards then it is a good coin to invest on and I will always look fr the long term investment on crypto currency.And it is not good to invest on a coin that price is increasing rapidly because if a coin rises too fast then for sure the price will dump so you can get that coins at the dump.
But now every altcoin transaction fee is very cheaper so it is not a good idea to pick up a coin based on the characteristics you quoted above.