Would be a war. Spence would go right at Trindad and it would be back and forth. I think Trinidad goes down early, and comes from behind to stop Spence in the late rounds.
Unless Spence proves to have a special chin I'd expect Trinidad to really light him up when he comes forward with his gloves up trying to walk to Trinidad. Brook was able twirl his head around a bit and he's always gotten touched.
Would have to see how Spence's chin holds up before picking him in fight like this, Tito was an excellent welterweight.