Tee
Tee
If they just want a clear view of the Aortic Valve TEE is best - only thing between heart is the wall of the esophogus.
On a standard Echo you have the ribs, etc all getting in the way.
When I had sever symptons my Echo showed minimal leakage, and then my cardiac cath confirmed this was wrong. But when they wanted the best look at the valve - to see if I was a candidate for a Tisue Saving Bicuspid repair they did the TEE.
Also they may scare you saying its possible to perforate your Esophogus before the test - relax -they relax you and it is an extremely safe and easy test.
Good luck.