If something goes in, can it get out of the water by the dock? If not, and it could get out of the shallow water area then I'd switch. If yes to both, then I don't know if there would be a big difference.

www.hoosierpondpros.com

[Linked Image from lh6.ggpht.com]
http://www.pondboss.com/subscribe.asp?c=4
3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).