So, I know I already answered this question a while back, but here’s some info that might be of interest.
I looked back through the videos of all the “push” GRs I’ve recorded over the past few years. All of these, AFAIK, were the highest Leapquake clear at that paragon level, at the time they were completed. So, y’know, pretty hard. The maps for those were:
122: Festering - Battlefield
123: Battlefield - Firstborn - Festering - Arreat
124: Festering - Cave - Festering
126: Festering - Moors
133: Spire - Festering
134: Festering - Battlefield
135: Festering - Cave - Moors
136: Festering - Festering
137: Festering - Cathedral
These 9 rifts contained a total of 22 separate levels, and 11 of those were Festering. 7/9 first floors were Festering. And not a single one of these rifts didn’t have a Festering somewhere.
{{Edit: Much later addition:
138: Battlefield - Desert
139: Festering (single floor)}}
{{2nd Edit, still later:
140: Cemetery (single floor)}}
So, to kind of re-answer your question, it obviously helps a ton to get a Festering for your level 1. This is a bit of a small sample size, so maybe I can’t make a totally sweeping statement about the value of different maps, but it sure kind of looks like even Battlefield is less good, on average, than Festering.
For clarity, I thought I’d also mention that I generally will play any rift that opens into: Festering, Battlefield, Spire, Desert, Moors, Hell Rift, and some that open into Pandemonium Fortress or Cathedral.
{{Later Edit: after the patch adding new maps to the pool, it is generally agreed that the single best map is Fields of Misery. After that are Festering, Battlefield, and Cemetery. }}