I'd be willing to bet that the frames on those two bikes are the same.
Probably… the bottom line is that “cheap” and unremarkable are not linked, just like “expensive” and “remarkable” aren’t.
You can get an amazingly light and responsive frame from the likes of Hongfu for just over 500quid last time I looked and they are truly amazing frames.
A reasonably priced Dolan Etape is an infinitely bett than the Emonda SL at a fraction of the price, so the equation really doesn’t stack up. Planet X used to make pretty impressive carbon bikes for not very much money at all.Maybe now that has changed.
You might have lucked out on the Supersix, which in rim brake version was a notoriously good frame, both in normal and HM version… but that is not to say that high end means remarkable.
In my days of working on cycling mags, I got to ride a lot of different carbon bikes. You really can tell the difference in the high end bikes. I had a custom Emonda, can’t recall what model, but it was listed at £9k in 2015 so probably more like £15k at today’s prices. It was terrifying to ride. Extraordinarily responsive. And bloody fast. Of course, that would be down to the frame geometry as much as the material.
Had a Focus Izalco as well, which at the time was the first off-the-shelf sub-7kg disc-brake road bike. So nippy that I was even able to keep up with zigzag for the first 30k of a 200k Audax until my legs started complaining. There’s just something about a bike like that that makes you want to ride fast.
Got to ride Elia Viviani’s Pinarello Dogma once. I got his bike because I’m about the same height as him but of course the pros ride tiny frames fitted with long seat posts and stems, so not the size of bike I’d normally ride. It was a very strange experience but I got on with it much better than the Emonda, strangely.
Also had a Domane to do LEJOG and it was an absolute delight to ride even though it was only an upper mid range model. Similarly an Orbea Avant, which I used for a couple of 400 and 600 audaxes. Very fast and very comfortable. I also did a 600 on an aluminium Domane and that was also a very nice ride but not as comfortable as the carbon model.
The Canyon Aeroad was a very different beast - built for straight line speed, very stiff.
One of my favourites was the Canyon Ultimate, which I think was just about the perfect sportive bike and ideal for a rider of my ability. A fast but very manageable bike.
I still have a Giant Defy in the garage, which has served me well over the years. It’s my standard Audax bike and very capable of the job but would be even better if it could take larger than 28mm tyres (as the more recent models can). It’s a good all-round workhorse of a bike - spritely yet stable and easy to handle, and comfortable over long distances.
There are many others I can’t recall now, some good, some not so good. But anyway, what it all comes down to is that carbon bikes are incredibly varied and frame geometry and components will make big differences to the ride quality, as much as the material. So the question shouldn’t be “Should I get a carbon bike?” but “Which carbon bike will suit my needs?”