Op-1, then Blofeld & Ms-20 mini
(out of the synths I own which are the only synths I’ve used)
I don’t necessarily feel the Op-1 sounds BETTER, I just feel it’s more interesting to design sounds given some of the “unconventional” ways you can shape them - The different parameters available in each synth & being able to move a patch made in 1 synth to another synth, plus the 4 track tape & samplers gives a lot of possibilities.
For example you can make a synth patch, then send that patch to another synth which has a whole nother set of parameters, reshape it, add an effect, lfo, ect, then sample that patch, shape it in the sampler, add another effect, lfo, ect, then record that to tape, add layers, add effects, then, then, then, then , then on & on forever if you like.
It’s endless & a different way of designing sounds in 1 box.