Too many variables in the question but if this is their first Spyderco of recommend a Sal or Eric designed knife.
Probably a Spyderco military fluted titanium if they can find one.
Otherwise any military variant. I used to be a delica fan but the military gets more pocket time.
Haves: Hungarian x3, Firefly x2, Orange Dragonfly 2, Orange Delica 4, Blue Delica 4, Orange Endura 4, Sliverax, Blurple Manix 2 s110v, Burnt Orange Meerkat hap40/sus410, spy dk orange, Pingo orange, Military Fluted Titanium, Lil sub-hilt, para 3 Rex45, friction folder, cricket, techno v1 xhp, spydiechef, slysz bowie, paysan, nirvana, subvert, ikuchi, smock, shaman (4v)
Wants: drunken, parata
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