Vanguard vs Fidelity vs others for Roth IRA

I’m wanting to open a Roth and begin contributing monthly. I will have $1000 to do so at the end of the month, and will contribute whatever the max is until retirement. So obviously this is long term. I want to start in the right spot though so when I choose one or the other, I’m going to stick with it. Ideally, I’d have a portfolio that is 4 index funds making up 80% of the account and then have 20% of the account to be able to try to capitalize on individual stock trading (not day trading, more like trend trading I suppose)... Or maybe I don’t need that many different index funds, maybe only 2 or 3... That’s not the point right now, although any opinion on that is worth consideration.

The meat of it is a lot of y’all on here look to be Vanguard guys, but looking around and researching, Fidelity looks more user friendly. This is according to a NerdWallet article specifically. One thing that did give me pause on Fidelity is when I google things about highest performing index funds over 10-15-20 years, a couple of Fidelity’s highest performer are “not open to new investors”. What’s up with that? Is that common across all services? Would I be able to buy those funds after a certain amount of time?

I’m going to continue researching, but it’s also time to shite or get off the pot in regards to opening an account somewhere... So, I come to y’all to help me out here. Any help and info is appreciated. Link the simplest articles or the most complex. I’ll read them all. Hopefully y’all will help me, and anybody else that has the same questions.