DSK wrote:

If you want to quibble, the water jets substitute impellers for
propellers. In some cases they are harder to access too, but in general
they're less troublesome IMHO... just like a big pump... in fact that's
what it is.

The trade-off is that they're less efficient at low speed because the
intake velocity gives the impeller/nozzle a boost just like apparent
wind for a sailboat. I don't know from my own experience, but I've heard
it said that they don't give as much kick for maneuvering at low speed,
but don't have prop walk so that's good.

No need to quibble, much less troublesome. Lots of "kick" at low speeds
since they accelerate a huge weight of water in a very short time and
put it anywhere you want it. Twin jets and a bow thruster are lovely.

The OP specified a 150' boat, rapid reversing capability, and precise
speed control ... all the attributes of jets in a boat that size.
Efficiency is not the highest rung on the ladder in that installation.

Rick