What is the best 3D printer?

There are a ton of options, your budget and goals will determine which you buy. I use the Prusa i3 MK3, a great machine, though a bit out dated by todays standards. The Ender 3 line of printers from Creality is extremely popular for a reason, because they are low cost and can work quite well. Though be warned, some tinkering will be required. There are many Ender clones on the market that are a bit better or worse, watch a few reviews before buying. A printer like the Bambu Lab X1 would be a great option for out of the box printing, though you will pay more.