You can pay once and then use it forever without updates.
Just subscribe for one month 
Quote from BuddyYou can pay once and then use it forever without updates.
Just subscribe for one month
Really??? So I can update(pay) whenever I want? that is a strange subscription model 
Anyway, learning UDK is similar to UE4? would it be worth it?
Buddy is right. Also I would suggest just jumping right into UE4, its changed a bunch from UDK so messing around in UDK wouldn't really benefit you that much (ex. no point in getting used to kismet when we have blueprints now). UE4 is pretty dang powerful, there's plenty of fantastic video tutorials, and honestly if you're familiar with making maps or modeling it shouldn't be that difficult to get into. If you do get the subscription now just hope that 4.2 comes out before your month is up. I initially went in with the plan of only paying one month but they just keep releasing so many updates I can't stop myself.
well really it depends on what your doing, if your simply learning map construction, then both are fine.
If you want to make an entire indy game, then U4 is the best idea.
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