I had a thymectomy in February and my surgeon used the VATS procedure, which is one of the least invasive procedures. From my research there was no evidence I could find that made a case for one procedure over another.

I had my surgery on a Thursday morning and was out on Monday morning, but could have been out sooner if I didn't have some weakness issues that required an IVIg treatment and return to the ICU after leaving it the day after surgery.

I'd inquire in the different methods and understand why your surgeon prefers one over the other. There are lots of videos on YouTube of the various procedures you can check out.

For reference, I had a 5 cm thymoma that was tangled around my phrenic nerve that had to be cut, which required some extra work to push my diaphragm down on that side as to not interfere with my lung function.