Like Pinch said, none of us can advise you or provide any financial advisory services, but we can at least express our opinions.
Personally I dump every spare penny I have in both. With pension contributions you get “free money” in the shape of tax relief and/or employer contribution and no taxes with the ISA
…broadly speaking of course.
Here’s a fun little online calculator you can play to see what you might have available to you when you decide to retire some day:
Just enter your info in all the fields as best or accurate as you can