For construction I'd pick a Manix. The PM2 is great, I have 2 (standard S30v and a BBS black/blue m390), but the manix is a tank. Thicker at the tip. I wish BBS would do a black/blue m390 manix, I'd be all over it!
Either would be fine, honestly. Just depends on if you want a more tanky knife (manix) or a lighter all rounder (pm2). S30v is a great steel, but I do love m390/20cv. You really can't go wrong!
Spyderco : Resilience, Tenacious, Persistence, Manix 2 G10, Para 3 G10, Para 3 LW, Paramilitary 2,
BBS Paramilitary 2, Amalgam
Kershaw : Tone, Cryo, Cryo 2, Thermite, Atmos, Natrix 7007cf, Natrix 7008cf, Bareknuckle 7777, Bareknuckle 20cv, Concierge
Zero Tolerance : 0566CF, 0770CF, 0770GRYBW, 0562CF, 0470, 0456CF, 0095BW, 0801TI
Ontario : Rat 1
CRKT : Caligo
Civivi : Plethiros, Baklash
Cold Steel : AD10
Benchmade : 810-1401 Contego
Buck : 110, Bucklite 422
Artisan : Tradition