I do really like Konnect for the times when people are over and the mood for dancing strikes.
But most of the time it'll be me playing games traditionally. So gotta go with PS4.
The PS4 has more powerful usable hardware for gamering and the value is much better because not only is it $100 less, but more importantly the value for PSN+ over Xbox Live is immense.
And I'll still have the 360 for those dancy times.
Talk of string with no mention of gauge is fruitless.