I am surprised that so many are 100% in favour of the No.4. It has a lot of faults, and I will likely get flamed for pointing them out.
1. No way to strip the bolt for cleaning in combat, without a special tool. During beach landings, etc. this would be a MAJOR PITA. A friend dropped his SMLE overboard, cleaned it as best he could, but the mainspring shattered within the month. With a Mauser, you can totally strip and clean the bolt in a minute.
2. A blow on the trigger guard of a Lee - Enfield can ruin your trigger pull, or worse, as the trigger is pinned to the guard.
3. The Mk.1 rear sight is too slow to adjust when time is important. The Mauser rear sight adjusts quickly.
4. The butt on the No. 4 frequently works loose, and when it does, you need the armourer to tighten it.
5. Ten round mag is neither here nor there. It takes twice as long to load as a five rounder.
6. Some Lee-Enfields are nearly impossible to cycle when the bolt is dry. The Mauser works almost as well oiled, or dry.
7. You can dismantle a K98K completely with only one screwdriver. The No.4? Nope! Take it to the armourer...
I love my Lee-Enfields, more so than my Mausers, but I have to say that I see a lot more L-E's with all kinds of issues, than I do Mausers.