I can see now why training C/PF is easier for newer users :) More training
regimes that focus directly on those positions!
Definitely. The game engine also used to favor teams with strong inside games, so it was pretty much a no-brainer. However, when outside tactics were given more of an emphasis, people who had been training guards could make a ton of money. I haven't been too active on the market lately, but I assume that great guards will still command more money than great inside guys.
Switching to a skills vs tactics question: at what point is it good to decide which way to play the ball (outside focus or inside focus)? What are the criteria for deciding?
I think it's probably similar to deciding whether to play AOW, AIM, or normal in hattrick. If you've got a significant advantage in one sector, then you can focus there to maximize that.
Is it better to play normal focus if there really isn't a significant advantage one way or the other?
I'm not really sure. If you play an outside focus offense, for instance, that will help your outside ratings and hurt your inside ratings. And vice versa. Thus, if, for instance, your team's offensive ratings are identical to your opponent's defensive ratings, then maybe it makes sense to focus inside or outside to strengthen that particular area? I think it's hard to say, especially without knowing more about how the game engine actually works. Others may disagree.
And finally, how do I evaluate what tactics to use against an opponent?
Well, at its most basic, if your opponent's offense is strong in one sector and weak in another (relative to your defenses), then I'd play a tactic to support your defense in his strong sector. And if your opponent is particularly strong in a defensive sector, then I'd focus on attacking the other sector. There are also matchups to think about - if you've got a shutdown defender, maybe try to play him against the other team's big scorer.
Is there a particular upcoming opponent that you're trying to decide on tactics for?