We have used both Tournride and Bikeiberia.
If any member of your party is (say) 160 cm in height or shorter, you should check which frame sizes are on offer and not simply rely on entering the person's height on the order form. The bike supplied to us last year for my wife (160 cm) by Tournride was really too large (crossbar too high) to handle comfortably. Bikeiberia this year were able to supply a 14" frame which was very much better.
Apart from the above, both companies gave good service. There is the advantage with Tournride that you simply drop-off the bike(s) at their shop in central SdC. Bikeiberia uses a carrier to pick up the bikes ; you do not have to pack them but they do ask you to (if possible) wrap the saddle, handlebars etc in plastic which we were not aware of until we began our tour.
I might mention a further point re the Tournride Full Assistance : this is valuable and will convey you to the end of your stage (by taxi) if you have a breakdown BUT after about 1300 on a Saturday you are not going to find an open bike repair facility until Monday am...which presents a problem if you have pre-booked accommodation.