I don' 'no nuffin' 'bout iron keels, but
All things being equal for you as to layout, sailing characteristics, price etc, I'd go with the Catalina unless the Jeanneau dealer is willing to make some changes in the plumbing: starting with thick-walled rigid plastic water and holding tanks. You might want to print out some of the articles in the HM forum reference library and give 'em to the dealer. Unless it's a straight uphill run from the toilet to the tank, I don't have a real problem with the way it's plumbed...higher in the boat does have the advantage of allowing for more horizontal vent (see the article "holding tank odor--odor out the vent" in the HM library). If it is a straight uphill run, it should be replumbed with an arch in the line close to the toilet...down hill from the top of the arch to the tank. If it's too high to allow that, the tank needs to be relocated. Catalina has gotten a BIT better about their holding tank venting...at least they're not running the vent into a rail stanchion on all their boats any more. Ronco Plastics makes their tanks, which are top quality. However, the best alternative may be to forget the tank altogether...in your waters, you can use a Lectra/San instead.The toilet itself is no big deal. You can take delivery with the manual toilet and install a Raritan SeaEra conversion kit yourself, or negotiate the swap out as part of the deal. I doubt that you'll talk the Jeanneua dealer into making the necessary changes...they'll cost him money in shop man hours and parts--which prob'ly why he's pooh-poohing the electric toilet on the Catalina...if he can convince you it's not a good thing, he won't have to swap out the toilet.