Suggestions for wireless back up &hitch camera for TT

We would like to purchase a back up camera system for our TT that is wireless. We are looking for 2 camera set up that includes one camera for the rear of the TT and then one for license plate to help with hitching.
Analog versus Digital - the price difference is significant and tady brothers seems to be the most popular.

Anyone have any feedback on analog versus digital wireless to help us decide if the extra cost for digital makes a significant difference?