I think the dyno info is good to give you a starting point but the best comparison you do get is stock to tuned on each vehicle and even then it's often not accurate since you have no clue of the date/time/variables for each and every run. It's not uncommon for it to be on different days with different fuels.
It does seem that the livernois dyno graph has a lot less smoothing applied, either way it doesn't bother me, but if you visually smooth their curve the graphs look very similar between the two.
I picked Lund Racing for my tune and have been very pleased with the communication and feedback I get from Ken and the guys over there and would recommend them to anyone. Thats not to say anything bad about Livernois as I've never used them, but they seem to have a great reputation as well.
One thing I haven't heard much about yet is tuning from Torrie over at Unleashed, a lot of the Taurus SHO guys and I think some of the Flexs are using him and I would think he'll have something for the Explorer guys here soon, probably just waiting for someone to ask!