When two boats share the same hull type — in this case both the Tiara Yachts 3100 Coronet 2012 and the Tiara Yachts 3600 Open 2013 are deep vee designs with fiberglass construction — the buying decision usually comes down to a handful of practical questions: how many people are you putting on the water, how far do you trailer, and what does your tow vehicle weigh?

Size is the most obvious dividing line here. The Tiara Yachts 3600 Open 2013 measures 38,9 feet overall (2013), giving it roughly 5,8 additional feet of deck space compared to the Tiara Yachts 3100 Coronet 2012 at 33,1 feet (2012). Weight tells a clearer story for trailering families: the Tiara Yachts 3100 Coronet 2012 tips the scales at 1 355 lbs — 1 164 lbs more than the Tiara Yachts 3600 Open 2013 at 191 lbs. That difference is meaningful if you're working within a half-ton or three-quarter-ton truck's tow rating, especially once you factor in a motor, gear, and fuel.

Both boats share a closely matched power ceiling — 375 hp for the Tiara Yachts 3100 Coronet 2012 and 375 hp for the Tiara Yachts 3600 Open 2013. Real-world performance will come down more to which motor is actually bolted on, its load at the time, and whether it's a 4-stroke or 2-stroke setup. Fuel capacity breaks the other way: the Tiara Yachts 3600 Open 2013 carries 35 gallons versus 21 gallons in the Tiara Yachts 3100 Coronet 2012. On a lake day that's negligible, but for coastal cruising or long reservoir runs the extra range matters.

For family outings this is probably the sharpest distinction between the two. The Tiara Yachts 3600 Open 2013 is rated for 11 passengers, while the Tiara Yachts 3100 Coronet 2012 caps at 10. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Tiara Yachts 3600 Open 2013 could be the deciding factor.