For folders, mine would be my Large Micarta Sebenza Insingo but it's very closely followed by the Umnumzaan and the Paramilitary. It would be a tough decision, especially acounting for the "super" steel choices with the Para but the Insingo would win out in the end.
For fixed blades, I don't have as much experience but I'd probably choose an ESEE 4 for it's ruggedness and mid range size.