ok, so I spent some time analyzing whether it’s better to do on-color training to level your hero (e.g. training camp levels 5-9) or whether better to simply do common and uncommon training (level 1 and 2 in training camp).
EDIT - this analysis is geared at 4 and 5 star hereoes, who I’ve never seen NOT hit their special by max level. 3 star hereos you might want to only do groups of 10 one-star heroes, but that’s a different analysis and not one I care to do myself.
I broke it down in a spreadsheet and am showing the following:
Using 10 swords and packs to do 10 common and 10 uncommon trainings (20 heroes trained)
Using 10 swords and packs to do 10 on-color trainings (10 heroes trained)
Using 10 swords and packs to do 10 fast common and 10 uncommon trainings. (20 heroes trained)
I made several assumptions
Assumption #1 assumes that each common or uncommon training has an equal chance of colors (20% each red blue green purple yellow). Does not apply to the color specific training (levels 5-9) obviously (but I wanted to state it so it’s 100% clear).
Assumption #2 assumes that uncommon training gives a 50/50 split 1 star vs 2. Therefore 10 uncommon trainings will yield 5 one-star and 5 two-star heroes. FYI I tracked this after 1.9 update and for 310 uncommon trainings across 3 accounts, I got 155 one-star and 155 two-star. Smallish sample size, but large enough that I’m confident a 50/50 split is accurate enough.
On the spreadsheet:
I listed the xp gains for off- and on-color heroes for one- and two-star heroes on the bottom left.
The upper left shows the costs for each of the training types.
The top right portion shows the results of the trainings.
For 10 swords and 10 backpacks, doing regular common and uncommon training gives more XP than on-colored training (4368 to 3240) and it also takes less time ( 400 mins to 600 mins). I showed some of the total food costs at various levels (1, 28, 49) shown in columns PQR on the sheet. Total cost includes not just the training food cost, but also the eating (leveling) food cost (remember a common+ uncommon will produce twice as many heroes as a single on-color training for each sword+backpack).
The XP per food ratio also favors the uncommon+common over the colored training all the way up until a single hero training costs 12,000 food, which I believe is around level 63-65 for a 5-star.
Happy to discuss or shed extra light on anything shown. Just ask!
spreadsheet shown here: https://www.dropbox.com/l/scl/AAChSxAFoCrV-rDtbqk96cTFtaIdS8YYE8w
Note: posted edited to add clarification on the xp/ham ratio.
TL:DR version: 10 common + 10 uncommon always gives more XP than 10 colored trainings. The XP/ham ratio is also better all the way until around level 63-65 on a 5-star.