Outboards are the go. Cheaper/lighter/easy to maintain/tilt out of water when not using/easy to replace.No expensive props,shafts or sail drives. I’m currently doing hull extensions on a bob oram 8.8m sailing cat which Im converting into a powercat, It will be 10 metres in overall length when finished. By adding bouyancy aft (less rocker) it will help prevent squatting making it more efficient/faster. 2 x 20hp Honda engines cruise on one engine 7 to 8 knots or both 12 to 14 fuel usage 1.5 to 2 miles per litre. Advantages are Turn key Go (no waiting for the wind so the flappy rag can do its thing) No rudders(can navigate into more shallow water less than 1/2 a metre, easy to beach the list goes on. Cheers steve