That's a great question. I am not an authority on this, but FWIW, I think it depends on a lot of different factors. Maybe the most important consideration is how badly does your team need outside shooting? You generally get outside shooting from your guards, especially your SGs. If you don't have other players than can shoot 3s, you will probably have to take the 70 PER player simply because without enough deep threats, (human) opponents will pack the defense and then you will have a hard time scoring. On the other hand if you have a balanced offense, with the ability to get outside shooting from other players and other positions, then the 40/40 player could be the better choice. The nice thing about an inside-outside scorer is that regardless of what defense you face or what halftime adjustment the defense makes, your player will have a good chance of scoring. The other consideration depends on the player's athleticism and speed. Guards tend to have more speed and less athleticism, but there are some that are very athletic and equally, if not more, athletic than they are fast. A very athletic guard with a good LP rating can be very effective by shooting a high % and getting to the free throw line.