First, I don't accept the premise they cannot get two teams in. Unless Utah loses to a hapless Kansas squad this weekend, they will finish the season no worse than 11th and probably higher once conference championship games play out. They likely won't play in the title game, so they finish 10-2. Right now, The Little 12 has 3 teams in the Top 12, (same as the Big 10, BTW). So, to say they will never get more than one team in is demonstrably wrong just looking at this season.
So if the premise is which conference is it easier to get into the CFB if you are a school from Iowa? Gee, would I rather compete for second, place with Texas Tech, Arizona, Utah, or ASU; or compete for 4th place with: OSU, PSU, Michigan, Oregon, USC, Washington, Indiana.... That's a toughy.