I think that both pistols are superbly made but the Walther just edges it and is also the more attractive pistol IMO

Two big differences between the 2 pistols are the trigger pull/shootability and sights.

The LP53 has a nice crisp predictable 2nd stage let off that on mine is around 600grms. This is fine for target shooting.

However all Seniors that I have owned have had stiff dragging/creepy trigger pulls that really let them down and you have to work very hard to get decent groups even at short range. It also spoils the enjoyment in using the pistol.

The Premier addressed this issue with adjustment on sear overlap (like Mk1) but the Seniors (non adjustable) sliding sear trigger design was quite crude.

John