Welcome to the forum.
"I'm just wondering ..." (not "wandering").
Your choice of topic should depend on which one you find more interesting, which one you will be able to research to the requisite level and, given your last criterion, which one you will actually be able to back up/defend.
We don't suggest thesis titles here. When you have chosen your topic, you can give us the titles you are considering and we can look at the spelling, grammar and punctuation of that title.
Please note, though, that a thesis is simply a more advanced type of assignment and homework so we will not help with any part of the actual thesis itself. You have to write it yourself without help.
Student or Learner