My first PETG print was amazing. One of the best prints I ever did. Then I had 10 failures in a row. I went though 3 half rolls (kept changing them thinking it was cheap filament).

I had a CR-10v2 with the OEM bed springs. I stiffened them by adding a bunch of washers since it’s recommended to upgrade the OEM springs. Suddenly I had mostly good prints. I bought a filament dryer and started printing directly out of that. That solved most of the rest of my problems.

PETG is the “second easiest to print” because it can print below 250 and doesn’t need an enclosure, but that’s only part of the picture. It’s really picky with your first layer height, it doesn’t stick to itself very well with a layer fan on it, and it absorbs moisture (I live in a swamp, I have to print PETG out of a dryer).

I find ASA easier to print than PETG with most prints, with only a few warp-prone shapes where ASA is difficult. I try ASA first and keep more spools in hand than PETG.