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These days it the one factor that differentiates one brand against another is dealer network.

If you don't have a local service provider X nearby, consider the other brands.

While the Guardian/Outrage 18 came with a 150 hp motor, for your usage, I would be more concerned with displacement.

Mercury, BPR, Suzuki, Honda, Yamaha all make very good and reliable 150 hp motors. Fuel economy with 4 stroke or DFI is very good. As for thrust, it will come down to prop selection.

For props, I would not go with a engine dealer's advice but rather a prop specialist (I.e. Ken at Prop Gods) who know all the brands, 3 vs 4 bladed etc.

I think pricing/dealer network is going to help you decide. Get detailed quotes listing every item and price. Don't let the give you just one final #.