Water drops should freeze well with either systems at less than full power. The strobes increase the output with a longer burst time above certain levels. The quad head on for speedtron will give you the shortest times though because there are four tubes at 600ws each for a total capacity of 2400ws in that head. It takes the burst time from about 1/4000 down to about 1/15000 of a second which is quick enough for everything but the rifle bullet through the apple shot! But that's OK, everyone has seen that shot anyway. You can still do the neddle popping the balloon shot though!
-Craig
You can look up my number on my website if you want to chat.
www.craighphoto.com