I'm not really sure why this is debatable.
- Both consoles are dying (though Wii u still has some signs of life with big hits coming soon).
- Both consoles have limited exploits (vita hack is new and we are still learning and improving as the days go by, while Wii u exploit is limited cause we don't have IOSU, which is the equivalent to IOS for the Wii since you have one, you surely know about it)
- Both consoles are supposedly waiting for greater things in terms of hacking (IOSU for the Wii U, better backup compatibility for vita)
So assuming you like games on both consoles equally (or else why are we having this conversation if you are leaning towards one console vs the other?), it all comes down to price. Like people said, Wii u is almost double in price. So:
- You can get it and then easily save up for a vita, while it would be hard doing so if you are doing the opposite
- if the above is an issue, like people again said, buy a PS Vita TV.. It's dirt cheap.
Even if your decision is that you want the vita anyway, once again, like people said, why not do the obvious? Do the trade, sell the Wii U, buy a brand new vita (3.61 was just released and you only need the version before that one for the hacks, so I don't think any newly bought device will be on 3.61), buy a decent memory for the vita, and still probably end with leftover cash
In all cases, I don't see why a trade is NOT worth it