Best OBS alternatives?

I highly highly highly recommend GeForce Experience!
1. No lag, there is 0fps difference whether you're recording or not.
2. It's super easy to use. There aren't complicated settings that you need to research to find out the meaning of.
3. And finally, there's a function called "instant replay". This allows you to save the last 5/10 minutes of your gameplay without you having to start recording! All you have to do is a press a button - and it will record the last 5/10 minutes of the gameplay. So if you encounter a hacker (and you weren't recording) just press the button, trim it, upload and report! Simple!
https://www.nvidia.com/en-gb/geforce/geforce-experience/download/ - here!

 

Howdy bro. I don't have a very good computer myself, so OBS isn't the best option for me. So I use some thing called Icecream Screen Recorder, it is free to use (unless you want the full version), the quality is good, and it is perfect if your computer doesn't support OBS. Download it here

 

I would recommend the paid version of Bandicam, but it's not free. It can be a little bit expensive, but it runs super smooth and you can record in 1080p all the way to 4k. If you're trying to keep your recording free and if you're on a Windows 10 you can, while playing your game, press Windows Key + G and you should get a menu that allows you to record. Another great software is Xsplit GameCaster, it's free and you can record all the way up to 1080p, and stream up to 720p and I'm not sure about recording but Streaming is lagless! Good luck recording man!