There's a lot to be said for gaff-rigged catboats when singlehanding. They are typically quite beamy (up to 50% of length!), offering good initial stability w/out excessive draft, so you can poke into estuaries and coves. The mast is well forward: large, unobstructed cockpits and cabins, good for fambily daysailing or camping in. Two working lines: the gaff halyard and mainsheet. Mast is short, so one person can step it easily (the gaff supplies much of the final height). Mast is usually unstayed: simplifying setup, keeping the decks clear, allowing the boom to swing all the way out, and even permitting a sleeved luff. The gaff twists off in gusts, depowering the sail, and you can quickly reduce sail area by 'scandalizing' the gaff: dropping it behind the body of the main, moving the center of effort down and forward.
BTW, you can have a gaff-rigged anything: sloop, ketch, schooner, cutter. But they are most popular these days as catboats. The downsides to catboats and gaffers are as Dog says. Windward performance and top speed suffer without a headsail to direct flow over the back of a mainsail. Unless the mast of luff sleeve rotates, the mast causes turbulence on reaches. The boom is long and experiences large forces; it also hangs way overboard, causing the boat to wallow downwind. The large, low-aspects mains are hard to trim precisely, and draft may shift waaaay aft in gust, causing the boat to round up. Catboats often have immense rudders which may need some muscle in a blow.
Tradeoffs, as with everything sailing.

I'd give serious consideration to a catboat if I were pleasure cruising alone. Catboaters are kind, generous, mellow people. Among modern builders, Compac makes lovely catboats and gaffers. You'll see lots of cats& gaffs in New England, where they are historical, and along the gulf coast, where they do well in shallow water and chop. Cats and gaffers are short-run built and often meet high standards of finish and construction, as demanded by their traditionalist owners; expect higher prices than corresponding-length production sloops. A good used Marshall can fetch $20k.
The Catboat Association, Inc.
They make me smile.