It's really down to personal preference. Each console is a different tactile experience, really. I find that the new 2DS XL is more comfortable, and easier to fit into a pocket (I'm a chick, and women's clothing usually has smaller pockets, if any, so that's useful to me), but if you're not really going anywhere, then it's probably not
that important. I also find people with smaller hands gravitate to the n2DSXL more than the other ones for some reason? My cousin can barely hold a 3DSXL but the slimmer build of the n2DSXL helps his tiny 10-year-old fingers.
But, it's also important to take into account if you care about 3D functionality or not. If it really matters to you, then I'd say to go with the 3DSXL, but if not, eh.
@KokoseiJ has a good point. Is it a New 3DSXL or a regular 3DSXL? Because that does play into things quite a lot.