You might get slightly more power in a draw cut out of the primary cutting area of the khukuri (which is just a little ways out from the curve)--but you might find the khukuri shape a bit cumbersome for some applications, if you're comparing a short khukuri with a comparably-sized straight blade. Among the factors to consider, though, are thickness of the blades (khukuri blades, at least H.I. handforged ones, tend to be thicker than production blades made in the First World), and such other things as blade steel and differential tempering (H.I. khukuris are made of spring steel, and differentially tempered so that they are very hard in the primary cutting area, and somewhat soft to very soft elsewhere. This makes for a hard-to-snap blade, and one that can take a serious impact to the tip without the tip snapping off or chipping badly, because the steel there is inclined to bend rather than to break--but if you're contemplating doing a lot of cutting using the less-hard parts of the edge, which is what you'd likely do if you were using a khukuri as an all-around knife, you may find edge retention of the softer parts of the blade suboptimal.)
What I'd do is study the H.I. subforum until you get a sense of what's being offered and when, and then try and get a slightly-blemished or on-sale knife in the 15-inch-overall range on sale for about $65 (delivered)--which is a feasible price there. That way, you can see for yourself what we're all so excited about, and also see why we admit that there are limitations to these knives. Or, you could take the option of buying one of the 9-inch "baby" knives--which, though it might not be the most practical purchase you ever made, would be fun to use (if a bit thick for some applications--my 9" baby chitlangi khukuri, with its 5" blade, is a full 7mm thick at the spine). Since they tend to go for $25-30, it's not like you're shelling out much money. I doubt you'd end up making a tiny khukuri your everyday carry blade, but it's a heck of an interesting collector's item, and, if you get tired of it, you can likely find someone who'd love it as a gift. Frankly, it's hard to go far wrong with these knives, and there are those who own 12" overall-length H.I. khukuris and are very, very happy with them--I've given two as gifts, one to a guy who serves over in the "sandbox" now and then. These guys like them. Myself, having gotten used to the chopping power of the full-sized ones, I'd miss having the extra weight and length--and when I am going to be doing more slicing than chopping, I'll usually reach for a straight blade that's thinner. Your mileage may vary. I'd recommend giving them a try.