Keep the U1! Sinn is a great brand and very much a unicorn. Lots of street cred in the community. All collectors should have at least one German watch: NOMOS, Sinn, Lange.
I would say the U1 is the most quintessential Sinn model in terms of design and ethos for the brand. I also own a 104 which I love but I don't think it "Sinns" as hard as the U1.
Is it specifically the "Moonwatch" version of the Speedmaster you aren't bonding with?
Omega Speedmasters come in an enormous variety of styles, sizes and colours that, other than being chronographs, are quite distinct from one another.
This account is verified. WatchCrunch has confirmed that this account is the authentic presence for this person or brand.