I've always preferred intel and may opt for an i7. However AMD is much cheaper.
How does an Am3+ like the phenom x3 compare to the i7?
nobody knows because nobody has ever used it.
amd still tries to make processors?
I use AMD processors, but I don't know how they compare to Intel's and I frankly don't do anything particularly demanding with them
I believe the FX series is newer and more powerful than Phenom and probably more easily comparable to the i-series too. They both use AM3+