I believe the matrix is a bit more efficient (gpm/watts). If you are buying a new pump, I highly recommend getting a 2-speed! On low speed the pump will take about 1/2 the energy to move the same amount of water as high speed. The matrix 2-speed 1 hp is a great pump...it is the one I have.
If you tell us about your pool, filter and plumbing we can suggest a good match for it.
24x52 sharkline I I have decided to go with the Hayward s210T pro series filter and a 1h/p pump. I was going to use the intex 2650 sand filter I have but it come apart at the hose to tank connection so I am sending it back to amazon and ordering the new sand filter and trying to decide which pump to buy. Funds are getting thin that is why I did not include any two speed pumps. So if you could just steer towards a cheaper but good pump.
I have an old Powerflo 2 (3/4 HP) that I'm keeping around as a spare pump - I actually used it for 2 weeks last summer inbetween a 1.5 HP Superpump that the motor failed / rusted out and the replacement SuperFlo 1.5 HP that is installed right now. Only difference I can see on the manuals / sales brochures is that the Matrix is a newer design. Either one should do a fine job for your pool / filter. You probably don't need any more than the 3/4 HP models in either case, IMO.