Soldato
If you go for the P3D, you need to get rechargable cr123's otherwise it will cost a lot. Good charger and cells at fenix-store though.
It does depend on how often you use the torch.
For regular use rechargeables are better, but for occasional or emergency use disposables are better. With disposables the light will gradually fade as the battery is used up rather than suddenly disappear as can happen with rechargeables. In an emergency having some light is better than none. Disposables also have a long shelf life, whereas rechargeables will gradually lose charge over time.
It's also debateable which batteries - CR123 or AA - are better for emergency use. AA's can be found anywhere, but CR123s will have longer shelf life and longer use time. CR123s also work better in freezing conditions.