I personally would prefer more phases as it would give me a warm, fuzzy feeling, but not at the cost of $70.
With that in mind, what ELSE does the Maximus V Gene buy you?
Let's say the extra phases was worth 25 bucks (just a random number, insert your own figure if you want). Going strictly by Newegg's spec sheet, what you're getting for the other $45 is:
-higher possible out of the box memory speeds
"SupremeFX III" audio, which should be slightly better than the Crab on the ASRock
-swaps 2 USB 2.0 for 3.0
-More CPU and Chassis fan connectors
/reset buttons (these are neat but won't see much use outside of out of case testing)
-onboard DisplayPort instead of DVI
-If the picture is complete, more stuff in the box:
-4 more SATA cables (might be SATA 6Gbs, not sure)
-a door knob... thing (what is this called again?)
-USB header raiser
-Front Port/Power header that lets you plug everything into it first before you plug it into the motherboard (useful for cramped cases)
It's not a huge number of extras. Still, the above, along with the reasons you stated in favor of the Gene, coupled with the fact that I've had an exceptional
experience with the Maximus II Formula in the past (wish I could have afforded a Maximus IV Extreme-V for my SB build, but no), mean that I would go for the Gene in this situation.
2600K @ 4.8GHz; XSPC Rasa/RX240/RX120 Phobya Xtreme 200; Asus P8Z68-V Pro; 16GB Corsair Vengeance 1333 C9; 2x7970 OC w/ Razor 7970; Force GT 120GB; 3x F3 1TB; Corsair HX750; X-Fi Titanium; Corsair Obsidian 650D; Dell 2408WFP Rev. A01; 2x Dell U2412m