Everybody is different, but I really think the most tech friendly car hands down is the 210 E-class from 1996-to 2002.

Very simple vehicle and tech friendly.

Maybe because the car had so many little problems and it was the always in the shop for one reason or another thus allowing the techs to know the car like his girlfriends backside, possibly, but nonetheless easy to work on, and most of the jobs paid relatively decent on flat rate.
I used to love knocking out those dashboards especially when the customer was watching through the window while his car was being torn apart, and then being amazed that it all went back together without a scratch or problem.

Also the 202 C-class, 140 s-class, ML's, 220 S-class, although the S-class was relatively simple to work on at times, It was frustrating as to how many of them came in the shop for micro switch problems on the seats, and for broken junky plastic parts on the interior and crappy window problems.

I really think the interiors of the S-class 220 bodies are absolute junk.
I can't count how many ticked off customers came in to get their junky plastic seat panels replaced because they cracked every time the customer shiftet his/her weight getting in and out of the car, very lame.

I think they are just installing way too many creature comforts on theese new vehicles, thus just creating the opportunity for more crap to break.
I think that the 220 S-class cars are one of the worst vehicles to work on due to the many small little things that go wrong that just don't pay much to fix under warranty.

I really feel for the techs nowdays due to so many of the cuts in the flat rate times.
When I worked at the dealership, it was nothing to turn 100 plus hours in the shop, now it's almost like working for the gestapo when it comes to fixing a car, theese guys are having a good week if they can just turn 40+ hours.