Oh Dean.... Tough call mate.
Till the 70,s i too give it to Gottlieb.
In the 70,s though i have to go for Williams. DC flippers make Gottlieb games look like a slow train on a tea break.
I find both Gottlieb AND Williams 70's EM games to be mechanically reliable, but the design of the main relay bank on score motor shits me... its ALWAYS the switch UNDERNEATH that i have to adjust or clean - absolute pain in the butt and poor design in my book.
OK - no drop targets on WMS, but the games are twice as fast as Gottlieb.
So reliability.. i reckon the same... but give it to WMS for DC flippers.
GTB SYS 1 is a joke.. couldnt have got it worse.. a COMPLETE lack of understanding about grounding.
SYS 80.... Still didnt get it right
Its not really till SYS 3 that i reckon GTB made a solid system... this is a great system, mine runs fautlessly.
Overall though... on absolutely everything... i still lean towards Williams
Gav, remember I am talking mechanical dependibility and manufacture, not electrical or electronic which was crap