My experience is as long as my form is good, I am able to manage the increased mass for longer duration than adding velocity.
I compare this a little to the .45 vs 9mm debate where the added mass of the .45 retains energy longer after encountering resistance, whereas the 9mm requires a serious increase in velocity to achieve same.
Obviously this is an individual factor, depending on experience, technique, build, etc so we're going to get a wide spectrum of opinions no matter. In the short term or if deeper penetration per whack is not a factor, the difference becomes less and less a factor. Also in my case, I'm always balancing against pack weight - I'm willing to tote an extra half pound if it means a notable increase in performance. I am not willing to tote an extra 2 lbs, time is not a big factor nor is best penetration - I'm not building a cabin.
I used to carry Fiskars hatchets but have switched to traditional hatchets thinned out for better efficiency even though they weigh a half pound more (average) - they chop deeper per hit and throw a larger chip per hit. That's saying something too, as I am a true fan of the Fiskar's hatchets.
This is where I start looking for options that fit a niche - short enough handle to easily use one handed with little fatigue and not hang off my pack, long enough to provide good leverage for two hands (sliding grip optional), heavy enough to tackle medium fare. The Rinaldi looks like a good fit as I can readily choke up on it for all my odd camp tasks and it isn't awkward like a Western Boy's axe would be one handed, yet it packs more power than a traditional hatchet and only 5 ozs or so more weight - less than a pound total more than a Fiskars hatchet to keep things in context. That's an upgrade.