I have two modified v's. Where I fish ( mostly a combination of small or mid size lakes and a mid size river ) they work well. I rarely fish large lakes, but my larger boat works there as long as the weather doesn't get bad. I don't take my smaller boat out to the larger lakes even with favorable weather forecasts, just to risky. I only made that mistake once.
I took my 1442 mv to a large lake to tune the motor and just to see how it would do in open water not long after I got it. The weather was nice, and the forecast was fine. A light to moderate wind started blowing late in the day and the open water developed a heavy chop with some small waves. My boat and I handled it fine and it was fun, but 5 to 10 more mph winds would have made it scary and dangerous in my small boat and marginal in my larger boat.
I guess what I'm getting at is neither does well in real waves like what you get on a large lake or our largest rivers with high winds. Every year people in a 16' mod or semi v drown in our large lakes and rivers because they over estimate there boat, and under estimated the water body their on.
My mv's are more comfortable in the chop that develops with wind and boat traffic on the mid-size bodies of water I fish than a flat bottom would be. If I only fished small bodies of water I would get a flat bottom, but I don't so mv's suite me best.
Sorry for the long post. The coffee and thoughts of newbies reading this thread got the best of me.