Do you prefer TTE, CMR, or cardiac CT for the evaluation of PFOs?

In my experience, CMR does not have the spatial resolutions required to assess for a PFO, and cardiac CT (CCTA), while it has the spatial resolution, cannot reliably be performed with provocative maneuvers to increase RA pressure and induce right-to-left shunting as needed to visualize most PFOs. So...

My preference is to start with a bubble study on TTE and size it with TEE. If truly PFO and not ASD, I rarely need CMR or CT.