What bike should I get? For forests and city mainly
I don't think there is anyone who can tell you what you will like.  

It's all about the test ride.
If there is any way you can rent/borrow or test ride at the bike shop lots of different bikes to get a feel for the differences in the different kinds of bikes it's the best way to know what you want/need.

It's all about trade offs and the best way to know is to get out and try things. Build up your knowledge of how different bikes feel so you can make an informed decision.

Sometimes you can get something you really like by going to wider or narrower tires and a different seat.