It does not matter for me if it's auto or not, turning knobs is fun for me

Somewhere I read that autotuners are not so good for the finals as they are exposed to high SWR during the tuning process. My QRP tuner from QRPguys is okay, but not able to tune my random wire antenna on 80m (~25m long, 71 feet I think). A possible cause is also the environment at my home, a lot of QRM here. Haven't tried to tune it outside in nature yet.
I somehow got the impression that manual tuners are able to tune a wider range of impedance than auto tuners. I can't find any confirmation about that though.
Also, when using an amp in future that is more than 20W, how to use it then (LDG goes to 20W max). I assume the tuner is put between the radio and the amp then and disabled during tuning?
So far I got:
LDG 817 autotuner:
- autotuning
- no hassle
- smaller than MFJ
MFJ 971
- SWR Readings
- Power out readings
- can attach a random wire directly to the tuner if necessary
- supports up to 200W AND Qrp up to 6W
- finals not exposed to high swr during tuning process
- no batteries needed
- manual tuning = you got the control on what is happening