First time DIY tile floor in powder room--transition, leveling, grout?
You need to get the schluter profile with the same thickness as your tiles.  you don't need to account for the thinset because you will press the profile down on the thinset just like the tile.

That said, the T moulding has advantages.  First, it hides imperfections.  If you have several tiles at the transitions, it is very difficult to cut them to make a perfect straight line.  Second if your bamboo flooring shrinks and expands, you need to leave a small Gap at the transition which can be covered by the T