Like some for both.
I personally already have a new 3DS XL and I wanted it simply as I just didn't want to go back to normal sized 3DS screen sizes again, as I thought they were pretty small when I first got the original 3DS, then when I got the XL, I never wanted to go back, so same thought process here really.
What is cool with the new 3DS however is the screen is a little bigger than the original 3DS screens and of course the faceplates! That and the higher PPI of course. All of them are some reasons to prefer the new 3DS. Some would say the glossiness of the XL would put them off, but personally I love the gloss, it feels really great to me in my hands and while it may be a fingerprint magnet, I don't really care. That and I love the material texture (at least for the black one) with the carbon fibre-ish look to it.
The XL I really went for because of familiarity with the screen size really. I havent seen a new 3DS up close, so I can't say for sure if I'd be happy with the screen size or not, but the only other thing I don't like is it does seem a little more "kidish" with the full red/blue/green/yellow buttons, compared to the subtle coloured lettering on the XL. The only thing I can say I really miss on the XL is having no faceplates, as thats something I'd love to be able to do.