Tank is somewhat the same as the Drake. The Alligator does have 50% more shield hit points, meaning a passive shield tank will be stronger, making it a boat that forgives many newbie mistakes. Yet that is still not enough to solo every L3 mission, as a few have rooms capable of breaking through the Alligator's shield. Yet for the missions that do not have those rooms, the Alligator's DPS makes mission running faster.
For PvP the Alligator is an expensive clumsy Jack-of-all-trades, lacking DPS, range, or speed to perform any PvP role well.
Blueprint copies for the Alligator can be purchased from insurgency LP stores in Zarzakh or the Gurista FOB.