I like the idea of choosing more or less to scale a property that stays around but without knowing any detail about what I'm choosing it's the same as the game choosing for me. If the property was rolled randomly and assigned to the player, it would have the same effect. Personally I think having a clear option for the player that have "trade-offs" would be more rewarding. For example: The left side of the scale could be "more health but faster enemies" and the right side be "less health but higher jump height"; Now they player gets to decide which upgrade is more advantageous for them, and which downside is easier to deal with.