What should I do if I’m having trouble choosing between Theravada and Vajrayana Buddhism?

[Gami47]

[Dhammapardon]

Probably first clarify what you're seeking to yourself. Then see if either of those things has it. If still can't determine, maybe try some from both and then examine if either brings you closer to what you seek.

[Goofaholix]

Do you have to choose? If the choice isn't yet obvious presumably you're not ready to choose.

[Cause_and_Effect]

For me it was always about authenticity.
Get a copy of this

It's the starting point, and also this site
https://accesstoinsight.org/

Remember that the Theravada Pali Canon is accepted by both Mahayana and Vajrayana, but not the reverse.
So start at the original teachings, then see if you feel any need to go to anything else.

[Ontheway]

All those tantric practice, goddess/bodhisattva worship, mantra recitation, fire offering rituals....

Don't sound Buddha's teachings to me at all.

[bpallister]

I don't think you'll have many people suggesting Vajrayana in this forum.

[Dan74]

In order for practice to bear fruit, most of us need the right support. A teacher, who can provide guidance and a solid community to practice with. Id check out those. They may well prove to be more important that the specific flavour of the Dhamma/Dharma you decide on.

[Agnikan]

I’ve been told that there is something called Tantric Theravada.

[Ontheway]

I’ve been told that there is something called Tantric Theravada.

People can invent all sort of new terms. We even have Secular Theravada; modern Theravada, Classical Theravada...

I think we should try use the original term Vibhajjavada.

[santa100]

...

Experiment with each and pick one that meets the criteria set in AN 8.53.