which is best light (flood or Spot)

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I am thinking of putting a remote controlled light on my Sailfish 218wa boat for some night time nav for fishing. Which one makes more sense? GO-lite makes a flood - 60' x 80' or a spot - 850' Both are 6,500,000 candle power.
Also the web site says could be an issue with interference with the radio and the wireless
control. The wireless uses 433mhz.....do you think that should be a issue with the radio?


Anyone have any experience with these lights.

All opinions and suggestions are appreciated

thanks
earl