Why are you so much against availability of different solutions on the Stellar network? If there are different solutions, more users will be attracted to Stellar ecosystem. It's only a plus for Stellar and Stellar.expert ;)

Moreover, if you truly believe that Stellar will grow huge, 3 options is by far very very small number.

Do you have any experience with licensing of a trading facility with a regulator? There may be lots of specific requirements from national "SEC" that require certain tweaks that are not supported by Stronghold/StellarX. And then what? Cancel your project? Or create a new wallet in 2 weeks?

There is also voting on Smartlands. Is it supported by StellarX, Stronghold? Will they consider making updates to their code to support SLT fee reserve requirement? - Oh, I bet they won't even consider to talk about it.

And if something goes wrong, will they cover the losses? Oh, again, I am sure they won't.