Differences?????
Differences?????
One was led by Wolverine and the other by Cable. One had Deadpool and the other did not.
I'm assuming you mean Sam Humphries' Uncanny, and Hopeless's Cable and X-Force which ran simultaneously.
Cable and X-force ran under the premise that a group of fugitive mutants post AvX were acting to prevent apocalyptic visions had by Cable. The members were Cable, Domino, Colossus, Forge and Dr Nemesis; later joined by Boom Boom, and Hope.
Hopeless had a pretty deft hand for characterisation and humour and wrote an entertaining book after a very ordinary first arc. It wasn't a particularly bloody "guns and claws" style X-Force; but worth a read.
Larocca's art was very ordinary, sometimes poor. The browny orangey colouring was really dull. Late in the run Sandoval took over the art. He has a very stylised look, but definitely an improvement.
Uncanny X-Force was a loose grouping which initially came out of the Jean Grey school. I think initially on some sort of mission from Logan.
Members were Storm, Psylocke, Spiral, Bishop and puck, and heavily featuring Fantomex.
I think Humphrey's had some interesting ideas, (eg. I liked the Revenant Queen idea) but his execution of them was a bit sloppy. Also he often sacrificed characterisation, (his character's voices were never right) and a tight plot to do something cool.
There's some really lovely art in this book on the other hand.
Both X-Forces ended in a deeply underwhelming crossover, which didn't let us know where many of the characters ended up; and particularly irritatingly left Bishop in both limbo, and in a moral gray area.
If I was going to read one, I'd recommend Cable and X-Force. The writing is better and it's also much funnier. I'd miss the art in the other book. Neither is really a must read though.
"Self has no time for this."
I'd read Uncanny X-Force Volume 1 over both of those. And the current X-Force led by Cable.
Cable and X-Force was a great book that probably was doomed form the start by Marvel getting greedy and trying to have two X-Force books at the same time. The Humphries X-Force book was just a mess and should be avoided.
And for as much as people try to hype up Spurrier as some big name draw his current X-Force books is selling less now that Cable and X-Force was selling when it was cancelled for his book.
Who said he was a big name draw? He's a very good, very underrated writer in my view. He should be a draw IMO, but as you point out, unfortunately is not.
The whole twist with Cable in issue #6, for instance, was genius. Of course, Rob Liefeld immediately claimed that was his original idea for Cable. I'm skeptical, though. He seems to have had a lot of different ideas for the character's origin if he is to be believed.