XenForo or IPB? Which is better?

Which do you think i should use for my site

XenForo or IPB?

im mainly looking for easy customization, lots of features, and nice designs?

I also would liketo know which one Nulledbb is using?

I've used both, and I have to say that XenForo felt a lot better in design and professionalism. As for this website I have no idea what they're using :S

EDIT - Found the software they use:https://nulledbb.com/misc.php?action=help&hid=25

Xenforo is more secure in my opinion, and more stable, but if you wish a lot of addons and easy to get i would choose IPB

XenForo is a great forum engine from old developers of vBulletin 3.5-3.8. I think you must stick with it!

Trust me! You will use XenForo even you don't like it. Especially, XenForo have a wonderful URLs rewriting system. that you can't deny.
NulledBB is using Mybb.

btw, find my threads for the latest premium. XF resources

Xenforo have no match in market . so go with Xenforo and if you have extra money then buy vBulletin or IPB ..

NulledBB is using MyBB.

XenForo is a nice enough software, but from what I could gather, it is rather limited, yet easy to use.

IPB is easier to customize and I've seen some good things been done with it. Though it also sacrifices freedom for ease-of-use.

Though personally I'd recommend that you use either MyBB or vBulletin.

XenForo its the best...better then vbulletin or IPB,belive me

How come nulledbb uses Mybb? I used to use xenforo, because mybb is more secure at the code level or is it hard to break?

after many years i use vb 3 and vb4. i move my site to xenforo, now have xf2 is better, good speed, but you can try a test forum a sub domain after you can move a working site.