NES: Gun-Nac vs Zanac vs The Guardian Legend?

[MintyTheCat]

Of those three, probably Gun-Nac.

Crisis Force is probably the best shmup on the NES. Over Horizon and Dragon Spirit would round out my NES top three.

There are many decent Shmups on the NES/FC but RECCA for me is up there as one of the finest.

I really like the Gradius 1 and 2 ports too.

I keep coming back to SCAT and Abadox.