Bitcoin and altcoin are the best for trading but according to my view those people who want to invest for a long time and want to get a big profit they need to invest in bitcoin while those people who want to invest for short time and want to get less profit then altcoin is the best option for them.
Currently bitcoin is more feasible due to an upward trend, but traders spend more time in altcoin due to faster fluctuations, we can still earn profits even though the coins are red. This is indeed a strong characteristic. I focus on buying ethereum on a regular basis because I think they they will start to undermine market dominance with a more stable coin condition.