Pros and cons to both.

NiWhumpf ive used with no issues at all

ALTEK i have reservations with.. have used a couple of these and lack of credits displayed means you have 2 digits on display with nothing on them and this looks like a fault even though its not.
Also a TILT light that stays on when "same player shoots again" comes on...
.. this fault disappears when original board is put back in.

I use ALTEK when absolutely no other option ONLY