I've had a bunch of alt coins over the past 9 months since getting into crypto. I managed to make some wise choices in that time, and the bull rush up to January saw me with something like 25 of the top 100 coins making a fair bit money each day.

But the issue with having too many alts is the security factor having them stored on many exchanges, and the hassle pertaining to the need multiple wallets.

I eventually ended up selling most of them and consolidating the funds into 1 coin I believe will do well in the future.  

I've kept a few, but any more than about 6 can be a headache.

But if they are ERC20 tokens for example, that's not so bad. But the question I see many times and still can't answer confidently is "are you better off with $100 in 10 coins or $1000 in 1 coin?".

It depends sometimes. As 2 or 3 or those could moon. I liken it to roulette. Sometimes you need to put a few chips on a 4 way square, and twice that many on a straight up. Cuz you never know when that number will come up and pay big.