[I haven’t found something like this, please redirekt me, if i missed something.]
I have tried to compare Hero Academy Level 7 to the Training Camp using the percentages here https://empiresandpuzzles.fandom.com/wiki/Hero_Academy
My calculations show that (according to HA 7 gives only slightly more XP per day than TC 11. However, it needs more recruits (3x), more food (10x) and much more mats. Only advantage is less costs for feeding (4.5x less) due to less heroes to feed.
That is quite bad numbers imo. Did you get the same results? Of course, it all depends on the exact percentages…