Angel is more defined and obvious thanks to the solid color and black outline. It's often in your face when you see a cosplayer upclose or not so upclose.
Nudy is subtle and has a sparkle effect which is good for close ups but terrible from a far. It does have a 'moe moe kyun kyun' effect since it's very gentle.
I think they came up with a SUPER series where both types now come in larger diameters and bolder black outlines, haven't tried that yet so can't say how the SUPER Nudy/Angels are like. I can guess they're more... obvious/visible?