Why was Ayutthaya never able to conquer Burma but Burma was able to conquer and occupy Ayutthaya?

Unless Ayutthaya had powerful kings (Naresuan, Narai, Taksin), Ayutthaya never seemed to be able to conquer and occupy Burma. But how was it that Burma was always able to constantly go on the offensive and force Ayutthaya to fight many defensive wars? IIRC King Naresuan was one of the few Ayutthaya kings who was able to march onto Burma but even he had to retreat due to deteriorating logistics and lack of supplies. How was it that Burma was able to plunder and occupy Ayutthaya twice in 200 years but Ayutthaya was never able to truly go after Hongsawadee, Toungoo, etc.?

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