Side imaging question

I understand that down imaging transducer can be installed in the kayak with good results, but I am not finding any information on side imaging.   Does the side imaging make any difference on installing the transducer inside the kayak?

I would like to have side imaging, but not sure if its worth having if the transducer has to be external.

This should help.  Some pretty awesome tests done by kykfshr earlier this year:

http://www.northwestkayakanglers.com/index.php?topic=753

This should help.  Some pretty awesome tests done by kykfshr earlier this year:

http://www.northwestkayakanglers.com/index.php?topic=753

I can't open the link, it is off limits.

Oops!  Wrong link.  Here's the right one:

http://www.northwestkayakanglers.com/index.php?topic=7537

Thank you.