The sales page says the Prowler is fast. How will it compare to other ships such as the Vanguard, Redeemer or Cutlass.

The Prowler has a unique flight style relative to its fellow troop carriers, using low acceleration rates with a high SCM cap to stay stealthy, and boosting for exceptional acceleration when stealth is no longer the concern. So it is both faster and slower than those ships listed depending on what kind of speed you're talking about. Be judicious with that boost though - the Prowler holds a fair amount of fuel, but it's powerful boost nevertheless consumes fuel far more quickly than its intakes will regenerate.