I've seen all brands on trips for more than 4 decades.
The Sea and Sea YS-D2s along with Inon Z240s were the most reliable I'd say. If size isn't a concern the Ikelite DS125 / 160 /161 family also which produce wonderful light having a circular flash tube of 4800K temperature. Those are too big and unnecessary with compacts especially.
The only thing I don't care for on Sea & Sea strobes is the battery door compared to the Inon design. The Inon is CLEAR and if you lightly lube the o-ring or just the inner lip of the battery door (as the Inon manuals says to) it's almost impossible to flood one.
As to power on compact 1" sensor cameras bumping your ISO to 160, 200 and even 400 works fine with the much smaller Inon S2000 units. Take off the diffusers (I do sometimes) and you get 1/2 stop more power with very little reduction in beam angle. Positioning those little strobes in places bigger units can't fit is simply a joy when diving.
The Inon S2000 is also the same guide number (power rating) of 20, same as their old D2000 and now new D200 physically larger unit. I think the new D200 body identical to the more powerful Inon Z330 was a cost saving making two similar physical strobes at different price points.
I totally confess to being a fanatic on shedding weight and physical size of gear for travel. On far flung trips a pair of the Inon S2000 units also provide back up if anyone else's strobe(s) go down.
I've used Inon S2000 units for all underwater photography including wide angle shooting going on 4 years. I wouldn't discount the tiny Inon S2000 strobes .
99% of people complaining about power is they shoot too far away (!!!!!!!) No strobe will light really good color beyond 4' or so
David Haas
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