I personally prefer Classic Equine legacy boots because they have the support sling in the back. Or Pegasus boots. I use them on all four legs along with bell boots when competing. When I am just exercising at home I just use bell boots.
Everyone has a different preference to what they prefer, I don't like polo wraps, i just don't feel like they offer enough support for the horse, just a preference thing. Although I have plenty of friends that use them and have never had a problem with them.
I think the biggest key though is if they are put on correctly or not.