I think it is Ford vs. Chevy. I have been in both (like most have)....both great boats. Drive both, and buy whichever one you like better. If you like both equally, then defer to the boat with longer engine warranty.
I wouldn't worry too much about the resale....remember, these are bass boats....none of us should be looking at these purchases as investments/sound financial moves. We all lose money on these things (it's more like an ivestment in fun). While I agree that resale is stronger these days for 21 foot boats, who knows where the market will be when you sell the boat....it could have jumped up to 22 foot boats by then.