agree with above. if it's hot and you are fast, a set won't last 4 days. medium heat and a decent rider and you will still struggle although not impossible if you are a novice group rider.
No real difference between the two tyres you suggest, but they are both soft tyres and give superb grip and if you are fast will wear on the edges, but for road use will possibly go square.
I would go with either but take a spare rear with me (rears last a lot longer, maybe 2:1 or 3:1), or at least order it from the tyre guy out there so you have it in reserve.