Ok i'll bite.
From a tinkering point of view my favorite movement is the 70xx, Why? because they are basic and easy to work on, parts are easy to come by and not silly expensive. The 7s movements are much the same but imo seem to lack in quality.
Having said all that, i've just discovered the Orient 487. It appears to be a quality 7s but with the auto wind mech very akin to a seiko 6 series, and ive since discovered that some Seiko 7s parts are a direct fit.
From a tinkering point of view my favorite movement is the 70xx, Why? because they are basic and easy to work on, parts are easy to come by and not silly expensive. The 7s movements are much the same but imo seem to lack in quality.
Having said all that, i've just discovered the Orient 487. It appears to be a quality 7s but with the auto wind mech very akin to a seiko 6 series, and ive since discovered that some Seiko 7s parts are a direct fit.