All sources (ns, ps and fs) are good for special purposes.

Nanosecond pulses are typically used in applications which require high material removal rate but do not require high accuracy, low heat affected zone and high quality of the processed structure (industrial engraving, ads, souvenirs etc.). Typically average power of ns fiber sources ranges from 10 to 100 W (Though IPG offers "Megapulse" with 4KW average power, but very bad beam quality). Typical values of beam quality factor M2 grows from 1.05 to 2-3 with power growth. It is caused with the fact that larger core diameters are used with power scaling. Generally these lasers produce pulses of about rectangular temporal shape. Fiber laser organized with MOPA architecture produce pulses of Gaussian-like temporal shape. But this type of sources shares no more than 10-15% of the market. Single-pulse energy is limited with the fiber laser-induced damage threshold and does not generally exceed 1 (maximum 2) mJ for 80-100 ns pulse length and SM fiber. It means that fiber laser with average power 20W and repetition rate 0-200 KHz emits 1.0 mJ pulses in frequency range 0-20 KHz (At 100 Hz rep_rate average power is 0.1W). In higher repetition rates pulse energy becomes 20W/Rep_Rate.

There is a number of ps and fs sources that can be called "all-in-fiber". They are mostly organized with using fiber interferometers and emit irregular (in shape and amplitude) ps and fs pulses with very high repetition rate (typically 20 - 50 MHz). Pulse energy is 0.00000... mJ. The benefit of this type of lasers in engraving is unclear. They produce patterns like cw lasers (maybe a little bit better).

Industrial ps and fs lasers always contain external pulse stretcher and compressor (non-fiber). It allow getting pulses of acceptable power (from 0.02 to 1 mJ) with industrial repetition rates (hundreds KHz). Typical applications for these lasers are all processes which require "cold ablation" = close to zero heat affected zone. They includes processing in microelectronics, ceramics, semiconductors, photovoltaics, thin layers and films etc.

Due to above mentioned limitations (fiber LID)  LMA (Large Mode Area) and Rod-Fiber lasers are now actively investigated. A number of commercial models are offered (basically France). These lasers combine advantages of fiber pump concept and large mode area of conventional DPSS, they provide simple frequency conversion and installation of external cavity for getting some special features.

Typical prices (rough estimates) 

ns fiber laser, 20W avg                                       $5000 - 10000

fs-ps "all fiber' laser, 10W, rep. rate 30 MHz      $10000 - 15000

"true" ps fiber laser with extermal module          $50000 - 100000  

"true" fs fiber laser with extermal module          $70000 - 200000

I think it depends on your request. If you don't need very short pulse, ns fibre laser is enough. Actually, ns fibre laser can match most of the applications. 

Thanks you sirs!!!!!!