788DI or 798 for bow unit

I got an opinion from Kosmo on this a whle back, but thought I would see if anyone else runs these set ups and what they would prefer. If you run a SI/DI unit and a DI unit which would you prefer? here is my scenario, I have a 898 on the console and will be loking for a second unit on the bow. I am thinking either a 788DI or a 798. Does the DI unit really have that much better of a picture with the dedicated crystals? or would you prefer a second SI unit up front?

Just a point to remember.....both units have to be SI capable for you to see SI info from 1 unit to the other....

I'm pretty sure the 788 would not show SI info from the 898 if you linked them together....

So while you may get better DI images on the dedicated DI crystals of the 788DI....SI info can only be viewed on the 898..in your scenario...

Rickie