Bitcoin is the best if you're into trading or investing and holding. What you need in trading is a asset that will be volatile but has the smallest risk of disappearing. An asset that already has value because of it's technology.
High volume, adoption, security, use cases, decentralization, limited supply are the main points to follow if you want crypto profits. Again Bitcoin comes first. There's a lot of people who search for these points in other crypto's, most of them in different ico's but the truth is most ico's and alts fail to provide security and real decentralization which in turn scare away high volume leaving them with no use cases. The ico succes rate was somewhere at 93% in June 2017 and got to 23% in November 2017. I don't know the 2018 numbers but with this bear market i would be amazed if the success rate was over 1%.
For most people who want to invest 100 bucks may seem that bitcoin is out of reach because they want to buy a "whole something" not a fraction of something. I guess that's how we're programmed to think.  

The brightest minds in the world are interested in bitcoin and are looking for solutions to develop even further this currency. Why would you invest or trade something else?
(i did not say gamble, we all know how gamble ends if you bet constantly on something that has a very low success rate like altcoins these days)