I've paddled both...
Project is an awesome boat...and so is the agent. First, they are both built in the same place, and that is evident when comparing them. What I noticed what seperates them is that the agent has slightly sless volume in the nose. This made it easier for me to initiate for loops. However, I am a 5'6 165lb dude, that like to fit into small boats.
The answer, and what everyone Should be telling you... try both, alot. If you are going to drop a G on a boat you better like it a bunch, and comparing these two boats is so subjective to paddling style it's too hard to tell. I've paddled the project 45 at least 7 sessions at my local hole, and the agent only once. I can't tell you untill I paddle the agent a bunch more, but my hunch leans towards the project. And everyone tells me I 'should' paddle the 52, but my feet have plenty of room in 45 and I get enough pop for ariels. Having tried the 52 an equal amount of time I want the 45, cause I can throw it around. But that is contrary to what WS and most people would tell me at the store. Anyway, don't buy anything untill you're sure and only listen to your first hand experience in each boat.