http://sunlightfoundation.com/blog/2013/04/15/tax-preparers-...
Unfortunately, even TaxACT is a member of a lobbying group which fights against making filing taxes easier (ACTR).
I find it hard to believe there are tons of them out there unless perhaps tax software is regional software and there's companies in some states that don't move beyond the state?
Disclosure - I'm the CEO of Common Form[2]. My co-founders and I are all ex-Intuit employees. We currently only cover the 1040EZ, but we're expanding as fast as we can.
[0] http://apps.irs.gov/app/freeFile/jsp/index.jsp?ck
edit: formatting.
I just did TT and it cost me $37 for what TaxACT wants $12. Further if you want to pay from your refund, there is hefty $37 extra with TT. It looks like TaxACT doesn't have this fee...
Most likely the result of your return should be the same from both companies, as long as they understand tax law, and I would assume they do otherwise they would be gone long time ago.