I anticipate that Zed's rate of improvement will be faster that Jetbrains', a small team of highly competent developers always moves faster than a big business. I've been maining PyCharm/IDEA for years, but Zed has gotten so good that I already see few real reasons to come back.
The UI is a bit different for each and I got used to the differences I guess. I have a lot of projects and I pick one IDE for each and then do not deviate from it.