Wilson, 30, was at Ulster for five years before joining current side Northampton Saints and ahead of his return this summer he admits that the culture has completely changed in the time he's been away.
"It's incomparable now to what we had then, the set-up that's been put in place now by David Humphreys and others is great," Wilson told the Belfast Telegraph.
"For me I'm at my best when I'm enjoying my rugby, and I'm enjoying my rugby when I'm winning.
"I genuinely believe Ulster can go all the way in Europe which is exciting for me.
"I am here principally for rugby and Ulster are now one of the strongest teams in Europe, so it made sense for me.
"Life in Northampton has been really kind to me.
"I've made a lot of friends over here, and I know I've improved as a rugby player.
"The club have been brilliant with me leaving, it's all been very amicable, they've given me their full backing and have thanked me for my efforts. I just thought the time was right to go back home."
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