the 18" Ontario I bought for my backpack camping getup has been used on every campout until the most recent one, and it's a good all-around machete with some heft to it for chopping fat stuff (I cut a 10" tree into rounds with it [it sucked, but it was doable]) but if you keep it sharp it can also slice vegetation too. It's not the lightest, but it certainly can do heavy duty stuff. I batonned 12" rounds with it, it twisted and flexed past knots and at times was 20 degrees off of straight both vertically and horizontally (at the same time) and still snapped back to normal after it got through.
And for the price, it's hard to beat.