If that's money you're setting aside for investment, I'd strongly recommend BTC. That's what I'd do if I had $1,5k personally... i'd buy BTC. The condition is that I already have an emergency fund and enough FIAT money for day-to-day expenses until the next payday. In my opinion, Bitcoin has more going for it compared to altcoins. To this day, Bitcoin still has the potential to surprise, at least until the next halving.

Believe me, Bitcoin has a lot of supporters and potentially more institutional investors... that's why Bitcoin is more favorable than altcoins.