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There are plenty more who can comment....but whatever the design it's down to how good it is and how well it's executed. Feedback can work on some amps but it has to be done well.
Without feedback you make the amp less likely cope with some types of loads and it's spec may look poorer but you should gain on harmonic representation, overall feel of air and space without tiring harshness. Horses for courses and a lot depends on your speakers,
Feedback is used in SS amps because it has to be. Triodes on the other hand, are linear enough to be used without feedback. In fact, DHT's are still the most linear amplifying device yet made.
The finest amplifier I have ever heard was a WAD 300B PP valve amplifier which had no feedback but which had a switch to enable it to be switched in or out. With the feedback switched out the space and atmosphere was staggering but with it switched in all of that was lost. I always used it with no feedback. That amplifier was just so pure and open and spacious it was almost unreal. I have never heard the likes of it since.