Which is better? Kinda hard to decide really. Spider-man's spider-sense is more effective in combat but radar sense is more versatile and more useful in day to day life. To put it bluntly if you're going to be in a lot of fights then spider-sense is definitely more efficient but if you just want something to make day to day life easier/amusing then radar sense is the one to pick.
Unless of course you're allowed to train you're spider-sense to this level:
In which case spider-sense outclasses radar sense by a lot.
@Strider92: How many disciplines have Batman mastered? and out of those he knows which are deadly! he doesn't have to kill you to Incapacitate you! Ezio will be taking a good nap when the Bat gets done with him!
This is Arkham Asylum Batman not comic one. In the game if he didn't KO guys he knocked to the floor they could get up another 2-3times. Ezio would just stab them and be done with it. Thus allowing him to attack Batman while he's still fighting the guards.
In a 1v1 encounter it could go either way but what clinches it for me is that guards. As Batman does not kill he is going to have to beat the guards in h2h then KO while the are on the floor (you tried KOing goons with just normal attacks an not hitting them when they are down? they get up like 2-3times before getting KO'd). Ezio on the other hand will cut through them like a buzzsaw due to his morals. So he'll have cleared his guards while Batman is still fighting. It's not much of an advantage to Ezio but its still enough to shift the balance. The guards give Ezio the distraction he needs to put a blade through Batman's neck.