Many comments about 146/RJ, mostly same opinions from tech side. Still my all time favorite hands on type, those beasts need work to go on, but hey thats why we are there.
J41, not that bad from my sight. Little brother 31 was/is much worse. S2000, fine and robust a/c but lots of work.
737 CL/NG, boring workhorse. Always hated dirty-oily-wet MLG bay, only airliner i have worked which have rain in MLG bay... (water pouring in, and over you when doing something on turnaround) Very forgiving AMM/MEL, just GO.
A32x, bit boring and too much just resets. Most of the days easy for techs, most of the days...
Which is the best? It depends what you want, for lazy b*stards 737/A32x etc etc. Enthuasists,and easily bored individuals may find good points from less liked types... bring in your wrench.