Pretty much anything from th past few years will blow the Pi3 out of the water.
€20 is a very meagre price though, so will limit things quite a lot.
I still use an S912 as a secondary box and it works quite well and iff the M8S Plus L meets your needs then go for it.
But I would look at fleabay and spend a little extra to get an S905X3, which is now quite well supported and off course, up to date, meaning that support will continue for much longer than the S912 will.
If you up your budget to €30-€35 then the possibilities will open far more widely.
And black friday is around the corner, so many a bargain to be had then too.