I would say look closely at what the ceremony involves, the kind of commitment it involves making, and then determine what outcome that will have on your practice.
I did a personal, private refuge ceremony for myself many years ago, but it wasn't nearly the same as when I finally was able to get to a monastery and take it with a Theravadan monk. (Oddly enough the place is called Dhamma Wheel!) For me it was very moving and powerful and really locked everything in for me. It changed my practice and I take the precepts a lot more seriously now.
The tibetan ceremony may ask you to take refuge in a Guru, something which most Theravadans would probably be uncomfortable with. You might also get a Tibetan Buddhist name! Nothing wrong with that but it might not set you on the path you are looking for. I personally would wait until you can do it with a Theravadan monk, though the Tibetan place might be a nice spot to practice meditation in the meantime.