mageith: Leo's not a doctor, but he can help others by preventing a stamina or sanity. A stamina or sanity is worth 2 points. Lily can protect herself by restoring a sanity or stamina -- Also worth 2 points.
Frank writes: That assertion is wholly unjustifiable. Preventing the loss of a Stamina or Sanity is better than healing one after the fact, because it can stop people from going to the Hospital. So for example: if our Professor was exposed to one or two Stamina loss then he would be at the same point if Leo prevented a loss or he got healed by 1 afterward. But he would be in a much better situation if he suffered a loss of 3 and had one prevented vs. suffering a loss of 3 and having healing available next upkeep. That fact alone makes Leo far superior to the doctor, the psychiatrist, or the martial artist - his power essentially increases people's turn by turn resilience, and the others don't. But beyond that, providing your bonus to any character who needs it is better than providing it to yourself.
Mageith: Wow! You are superlative at superlatives to emphasize (or exagerrate) minor differences. The net result for the team between Leo and Lily's healing/preventative skills is nearly negliable. I'll concede that preventing another's damage is superior to healing one's self at the cost of a focus point. I'm pretty sure I conceded that earlier. However 2 points is 2 points and their abilities are directly comparable. So I can't agree with your assertions that one is much better or far superior than the other here. I can go with superior and better, if that will help.
Frank: Lily's power doesn't do anything at all on those turns in which she wins her fights, goes shopping, or has an uneventful time in another world. If she personally isn't injured, her power is useless next turn. For Leo's power to be invalidated, every single other character has to go uninjured for a whole turn. In a two player game, his ability is useless half as often. In a six player game, his ability is useless one sixth as often.
Mageith: Both of their powers will probably go unused on the first turn. But if Lily loses more than one stamina or sanity, then she can heal herself while shopping, etc. Lily's power does take some action by her to kick in and Leo's only requires that someone remember he has it. Again, in most cases Leo's healing power is superior. However, Lily as an investigator is as useful as Leo, however which has always been my contention. In fact, if I were need to rate one or the other as better, I'd always prefer to have Lily except against Glaaki. Leo is just as good against every Old One.
In fact, when I did my own personal rating of investigators, Leo was the standard for average. In order to be an average investigator, you had to be able to bring back an average of nearly 2 points TO THE TEAM per turn. As you stated, Leo can do that practically every turn. But he can never do better than that. Any investigator that can't bring back 1 point per turn is a drag on the team (Dexter is the worst since is very weak power is seldom even used.). Superior investigators bring back more than 2 points per turn, I put Darrell in that category because if he deliberatley uses is skill, he should be able to maximize the good things of encounters and more importantly prevent the horrible gate/monster from appearing. But Gloria is below average even though her power looks similar because she's unlikely to return value and her power will probably only be used 4 times in a normal game. Three characters were even better than that: Mandy, Daisy and Wendy. (Being able to remove 1 gate or stop 1 gate/monster automatically qualified an investigator for average or OK status, for example Marie, Kate and Wilson.)
Frank: Even if Lily's power were twice as big as Leo's, it still wouldn't be as good because Leo's works to save people instead of cleaning up next upkeep, and Leo's works to save who needs saving instead of just saving Lily. It's a cooperative game, and cooperative powers are better than selfish powers. Full stop.
Mageith: Absolutely disagree that cooperative powers are better than selfish powers. Two of the best three top tier investigators are Daisy with the Summon Shantuk spell and Wendy. Both have selfish powers (though you could construct Daisy to be altruistic if you wanted.). The third top tier investigator is Mandy, which supports your assertion. Now I would agree that exactly comparable abilities that help others are superior to powers than are selfish. For example, Leo would be better than an investigator that has the healing stone power.