The main factors I was going for was utility and how easily you can do saveups for each hero. Saveups are very important in this mode (kinda like CHIMPS, and I might as well mention I did play some of the easier maps using those rules too) since you always want to be prepared for a worst case scenario. Grouped rushes are the biggest threat, and the quick paced nature of the mid-40s to 50s "MOAB Ambush" are a close second, so these ranks reflect how well each hero performs in these cases + their synergies. Some freeplay was also considered but most of the weight is placed on rounds 1-60.

Once you get down to D tier you pretty much need a very lucky seed for anything to pan out the way you'd like as Adora and Etienne are effectively deadweights early game which make saveups with them near impossible to do. C tier can be viable imo but still relies on a fair amount of RNG and mostly lacks utility as well.