in terms of short term/ positional trading and NOT holding, i'd say any alt coin that has a health amount of volume that isn't going on an insane bull run.

given that fundamentally it isn't a scam coin, and technically that it should be somewhat of a low dipping point, profit margins should be in your favor so long as you do your research.

safest best is probably the top 10-15 coins with highest trade volumes in your exchange (must be a good exchange with volume).