Although there are many more platforms than just the two we've discussed here, many implement similar architectures. If you're looking to build an enterprise-level advertising network and don't have the capability or resources to build a web platform, then ROXIMITY is the choice for you.
However, if you want more control over your beacon's implementation or want additional features beyond that of just the iBeacon specification, then Estimote or one of the other more open beacons is definitely a better choice.
You might have other considerations such as beacon size, cost, or branding of beacons. Check back to Chapter 1, Welcome to iBeacon, which gives a more in-depth run-down of some of the providers on the market at the time of writing.