What strobe to pick?

I currently have 1 Ultramax UXDS-1 and I want to add a 2nd strobe. I'm considering switching to a S&S YS-03 for future ttl setup, but that means buying 2.

I've been reading a book and it says the more powerful the strobe, the better. It seems the UXDS is more powerful, but does that mean its better?

Should i go for the 2x YS-03 instead?

Do you miss ttl now? Both quote a guide nr of 20 in air. I find the spec of 100x100 degrees coverage of the sea and sea hard to believe. What book are you reading? More powerful strobes help in balancing light on bright conditions in wide angle, but for macro they are less needed.

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