define best. Feature set? OBS. Actually working quickly and efficiently. You want Shadowplay for an NVidia GPU or ReLive for an AMD GPU. If you are using intel onboard graphics, dont bother, OBS is probably best bet there but takes too much cpu time.
OBS is nice indeed, simple enough for me to use. Finding working editor that does not cost arm and leg, does not glitch out and ruin video quality is then a harder piece.
Not much idea about the quality, but if you have Windows 10 you can use the built in recorder by using Windows key and g to open the game bar, and then use the record button on it.
I do that to record some B-25 landings . And yeah Windows button + G to open a bar that give you multiple choices like taking a screenshot or recording . These screenshots and recorded vids will be on a file called Captures and I can find them on my Xbox thingy for some reason .