I have a few.
Astro, Nemesis, King, 69, Hammer. (all clones)
They all hit hard with a good battery, and good atty on top.
Out of those I have to say I like the Hammer, and 69 mods the best with the Astro, and King a close second.
I am sorry but IMHO the Nemmy is overated in the 'ease of use' department.
Both the Hammer, and 69 I can set down without worry of it firing or being unstable because it's sitting on the switch.
I love the fact the 69 can take any battery I have without having to change/add/ take off tubes, and love the fact the switch lock is easy to work with only a 90 degree turn.
The Hammer I like because of it's small form factor (in 18350 mode) although the lock can sometimes give me grief (stuck locked open without any knurling to get a good grip on it).
The Astro is adjust able for all battery sizes also but has a single removable tube that would need to be taken off to work in 18350 mode.
The locking ring is knurled but I have had them come unlocked in my pocket while walking. The switch can be wobbly if you set the
mod down on it when unlocked.
The King is a well designed, and very beautiful mod. Great switch, easy to work locking ring, good adjustment design for variances in battery height but again tubes that need to be added/ removed to switch battery size. And it's almost too pretty for me to carry around.
Everyone knows the Nemmy but I have to say that although the locking ring stays locked (open or closed) spinning the thing for 20 revolutions to lock/ unlock it is a pain. It also suffers from the same 'left with a pocket full of tubes' syndrome when changing battery size. The stock switch can be finicky on how it's pressed, and 'clicky' until you upgrade to magnets.
I have heard good things about the M16, and panzer mods as well as the stingray but cannot comment on them since I haven't used them personally........yet.
