I didnt pick one, because I love both. But Ill throw out my opinions:
Other than tranny, both trucks are the same (assuming the 07 is a 5.9 and not a 6.7) The Lonestar Edition is just a package of popular options on the SLT, like power windows, locks, sliding rear window, tow hooks, fog lights, Sirius, etc. Thats it. Nothin fancy. Its the same as a Big Horn Edition or Thunder Road Package. So thats not really a selling point...
So, the thing is the tranny. Manuals are fun, and cheaper to upgrade a clutch (~1300+/-) as compared to an auto (~2k for VB/TC; 7k+ full billet tranny.) If you want to go fast, get the auto. Stock to stock theyre fairly close, start modding and you need a good amount more power in the manual to outrun an auto, and better be dang good at grabbin gears...towing with a stock auto, well Ive never done it so I cant tell ya. But towing with a built auto is just as good as a manual. Depending who you ask, it may be better.
My 03 is a 6speed, and one day Ill tackle making it fast. But I set out to get an auto in the 07 just on account of I wanted to go racing and get big power...and I know that Ill get another automatic some day, but it wont stay stock for long. Thatll be the first mod is getting the auto built. I have nothing negative to say about either trans; theyre both good and the autos, I think, have an unfair reputation for being weak. Theyll usually take a fair amount of abuse...