Kreepy Krawley or Navigator?

[Viv]

I am deciding between the Kreepy or the Navigator. In ground, concrete pool. Approx 15 x 40. Recently replastered, new skimmer, new pool sweep line, new tile line. Electric pool cover, (can these systems harm my pool cover?) Pool subject to lots of leaves and nearby sand box. Did not want to get into the expense of having an electrician set me up for pressure system (Phantom), and pool guy reconfiguring my sweep line set up (although can be easily done). Thanks for any advice! Viv