We were with boomi, went to workato. Others it's worth having a look at are jitterbit and mulesoft. I don't know if power.automate from microsoft extends that far out, but it might be worth looking at them too.
I found both boomi and workato pretty easy platforms to get to grips with. The way an integration is written in workato appeals more to the way my brain is wired, but I'm sure others would feel the opposite. Boomi seemed to have a more mature list of connectors but workato felt much more actively developed.
The boomi consultants we got were nowhere near as good as the workato consultants. Like workato consultants were happy to write code in netsuite to facilitate integrations.
Workato after 3 years came back with a revised pricing model (and fair usage model) that was nothing like as competitive as our initial deal, which was very disappointing. Until there's some kind of universal standard markup for an integration, I guess you're always at the mercy of things like this though as you're trapped on the platform you pick (depending on your commercial terms, I suppose)