The October trip is fully booked, so you can only go on the May one with 2 places left. Enjoy the security of a backup truck in Morocco if the bike breaks down. Not bad at £100 per day, for meals, hotels, ferries etc.
May is a good time to visit Morocco if you can swing it. As it is just emerging from spring, the countryside is much greener than you would imagine, and it's only six weeks away from the summer solstice, so the days are quite long.