I guess could probably make a case for being all 3: Theravada, Mahayana, and Vajrayana?
I love how the Nikaya Suttas sound in Pali (or at least what I've heard from the Thais & Sri Lankans) and Nikaya teachings are most of my foundation.
One of my biggest Buddhist influences in my day-to-day life is my muay thai coach, who's a Thai/Lao Theravadan.
Like the others, I feel particular affinity for the Bodhisattva path.
I practice at a temple that follows a Vietnamese lineage of TianTai (plus PureLand and Thien) and have had a lot of exposure to other Mahayana traditions in the past (Chinese Shaolin Chan, Chinese Pure Land, & Japanese Zen).
My favorite speakers are from the Tibetan Gelug tradition, I attend a Lam Rim study group a couple times a month, I'm an FPMT member, I take online FPMT courses, I have also received refuge, empowerment, and training from a Tibetan monk (Geshe Soepa).
I've seen a lot of the roots of other practices in the Nikayas (from PureLand practice to charnel ground practice).
I haven't hit that point where I have to make a choice yet and except from the Bodhisattva path, I don't see a whole lot of difference yet.
If I had to make a choice today, I'd stick with the Gelug tradition - mostly because the tradition is pretty universal (don't think I would have to lose the Pali Nikayas) & the teaching materials are very accessible.
月影の いたらぬ里は なけれども 眺むる人の 心にぞすむ