I'm not familiar enough with the range of Catalan accents to give an informed answer. I can tell Balearic from mainland Eastern Catalan and I could probably identify Northern Catalan due to the vowel shift, but that's about it. I can't distinguish Valencian from other Western Catalan varieties, and I certainly can't tell the difference between, say, Barcelonese and Tarragonese. But if you held a gun to my head, I might say Mallorcan, because I love listening to Antònia Font.

With Spanish there are just so many different accents that it's hard to choose. I have a soft spot for Peruvian Spanish (particularly Iquitense) because of some of the people I've known from there. But I suppose it's very telling that the kind of Spanish I myself try to speak is Castilian with a bit of a Catalan accent (although yeísta).