Part of your answer lies in where and how you intend to travel. If your going ocean cruising, enter atolls with strong current
access, etc then you will want that extra hp. Weve have found ourselves in oceans against the wind
and some times the current
and again, the extra hp go us out of it sooner. Ive also been in 6kt atoll entrances with near full power. If you intend to mosy around the caribbean
or med then the the smaller engines should be fine. From a resale point of view, the larger engines will give you an advantage. Along with having other options.
The L52 is underpowered with the 75hp engines and Lagoon after a lot of feedback are now offering the 80hp Yanmar
Up until a few years ago Lagoon were installing three blade Flexofolds on the Yanmar
54hp engines. We have them, very happy with them. Your agent should advise you further on the brand and type on the L42.