Facilities on the Wish (and presumably the sister ships) are hard to beat. The Wish offers all the perks of the previous classes of ship including hot tubs, but a much expanded outdoor space that actually has an ocean view, a full bar area, and the ability to do a special concierge hot food menu in addition to the snacks.
However, for me, I think the Magic gives the Wish a run for its money in terms of overall experience. The lounge is much smaller and lacks some of the amenities of the Wish lounge, but then again, we never make it to the hot tub on ships that have one and I'm just as happy getting Cabanas for hot food. The recent renovation of the Magic lounge is gorgeous, and I think what you lose in amenities you gain in intimate feel. There are fewer hosts (three vs five) so you are much more likely to see the same people and they're more likely to have time to chat with you. This is something I value, but I know that it's not something everyone cares about or prioritizes.
So, IMHO, if you want the most luxurious lounge experience, pick the Wish. If you want the most personalized host experience, pick the Magic. Really you can't go wrong either way though -- have an amazing time whatever you choose!