Differences between AA Highway 22 and Highway 15

[Rhino]

I've been doing a feature analysis of the H22 and H15 kits, trying to determine what I need.
Due to the H22 not having enough relays for my liking, I'll be running an additional under hood fuse box (Likely a 4th Gen F-body unit)

Even though these units are marketed as having 22 and 15 circuits, they have 14 and 9 fuses, respectively. Both kits also appear to include the same switches (ignition/dimmer), connectors, and adapters.

The difference between the connections of the 22 and 15 is as follows:
1.) Fan power
2.) Fan relay ground (trigger)
3.) 2 additional ignition power outputs
4.) H15 has shared brake switch/dome power. H22 has these functions broken out
5.) Dedicated fuel pump circuit
6.) Turn signal relay ground



This gives a grand total of 5 additional dedicated power circuits and two grounds.
I know for certain I will not be using the Fan power or relay grounds, or the fuel pump fuse as these would be duplicated by my under hood panel. I'm leaning toward purchasing the H15, since it's $100 cheaper, however I want to insure I'm not missing anything by doing so.

Is it worth the additional cost for 2 ignition power sources, and the ability to control my turning relay ground?