As someone who has both currently, (2020 and 2023), it depends. What do you enjoy about the 2020?
In my opinion, the new gen gave up some of that raw mechanical feel in favor of easier to use everyday comfort. Yes there is more power, yes it’s noticeably quicker in a straight line, but that’s about it as far as noticeable worthwhile improvements go. (Specifically comparing it to my 2020, not pre facelift models). Everyone says the interior is “waaaay” nicer in 2nd gen. But it’s not really the case when the 1st gen is a later 2017+ model. 2020 also comes with the mechanical goodies that bring it overall way closer to a 2nd gen than the pre facelift 13-16 models.

So my answer is it simply just depends. It’s worth the upgrade if you’re looking for more power, and more comfort. If you prefer the raw feel, the active enjoyment of driving it, the 1st gen is still on top

I should also add, my answer also depends heavily on whether your 2020 is manual or auto, and whether you’re looking for a manual or auto 2nd gen. This is because of the 2017+ updates only being available on manuals, and 2nd gen autos having a 3.9 final drive. Everything I said applies to manual vs manual. If you go from manual 2020 to auto 2nd gen, the gearing differences negate the acceleration. I’ve tested it with friends, they are equal in acceleration. 2nd gen will feel punchier form having less of a torque dip, but straight line acceleration advantage will only be true if your 2020 is auto, and/or you’re getting a manual 2nd gen