The more general shoe for that is the "camp moccasin", or "camp moc". Similar, but tends to have a tad less secure fit, and the sole's usually a little lighter (not specially designed to grip well on a wet wooden deck like a boat shoe—the name "boat shoe" isn't arbitrary). They're also a little sleeker-looking—typically one lace-hole rather than two as most boat shoes have, and I don't know my shoe-part terminology very well, but they usually lack the extra flaps over the top piece of leather where boat shoes put their lace holes, instead putting theirs directly in the main, top part of leather on the shoe. That also serves to make them a little lighter, in addition to the sole.
I'd recommend that style to someone who's only getting one of the two types. Some folks also notice the difference and will regard wearing boat shoes away from water, and especially wearing them with socks, as gauche, while camp mocs may "properly" be worn in almost any causal setting, with or without socks. Which, on the one hand, who gives a shit, but on the other, if you don't want the shoes for nautical purposes, no harm in getting the style that's a bit lighter & simpler-looking and won't draw ill judgement from anyone, socks or no socks, ocean-breeze or mountain cabin.
