Start here, this stuff has never let me down. I have used it for a very long time. Amazon.com : hatchbox pla Regular PLA, PLA+/pro/unicorn farts all has additives and you might as well just run PETG.
I tried Polar and unfortunately I also am have a tough time with it. The only way I can get it to stick is by printing the first layer very slow and the colors it prints are telling me the temps are wrong and I can’t seem to nail it. I am on my last roll of 20-30 I bought. The cardboard spools and price had me intrigued but I have never had a PLA like this, it just will not stick so I have only been printing large bottomed parts slowly with it.