Well it depends what level you are on the perk. For example you can be a level 6 medic, but be a level 1 sharpshooter, so the "better" one would be the medic. To level up on a perk you have to do the requirements for the next level (like for sharpshooter you might have to get a certain amount of head shots).The higher level you are on the perk, the more benefits you get. if you are asking which perk is simply "THE BEST", I will just say which ever one you are the best at.
If you mean how can you level up your perks in killing floor? Check your perk list and on a window it'll show the requirements to do in order to level up a perk...
the best class to use is your favourite smg with silencer and stinger as your secondary and perk 1 sleight of hand perk 2 asassin perk 3 stalker
Perk 1: Marathon Pro Perk 2: Stopping Power Pro Perk 3: Commando, Snipers - Steady Aim Pro.
Theres no such thing as a perk 7.5. There are Loratab 7.5 and hydrocodone 7.5 which are basically the same thing but no perk 7.5.
You can, but the coffee will be quite weak, the first 'perk' gets the best flavour and strength from the coffee.
Cause its the newest
silenced scarh -- Perk 1: scavenger or one man army Perk 2: coldblooded or stopping power Perk 3: steady aim or nija FAMAS -- Perk 1: scavenger or one man army Perk 2: stopping power Perk 3: steady aim m16 and ak47 are good as well
if in cod 6 make a class with a stinger perk 1 scavenger perk 2 COLD BLOODED and perk 3 watever. equipment use tac insertion.
Perk = sumigla
Bouncing Betty x2
Commando - It works very well with Silencer and the Perk Tier 1: GhostPython - You can use what ever Attachment. It's good with the Perk Tier 3: Second Chance
Perk is 6'.