Well if you are in doubt, you could ask the cardiologist to back up his decision by performing a nuclear scan. On the right medications and lifestyle, he might open sufficient collaterals to act as natural bypasses. The only real way to detect these is with a nuclear scan because they are so small.
In my opinion, diet changes or meditation can't undo blockages. They can be enormously important going forward, but when you have blockages, you have blockages.
I've had ten stents and also have had bypass surgery, so know the advantages and disadvantages. I'd ask for the least invasive procedure first and go from there, so I'd opt for stents, but you really need to frame this question to your doctor. Yoga and vegan food can really help going forward. Keep us informed.