No need to really ask the question, since it has been asked and answered over and over. So, I assume you are looking for comments that will agree with how your mind is already made up, and if it is on the top of Rob Sherwood’s list, it’s better than sliced bread.
But to your question. What are you trying to do, and which radio will do it better. If you are using a simple antenna system, then both are about the same. Sure, people try all sorts of mind games to come up which is better. Like … let me find the weakest signal on the band, and switch real fast between two radios. WoW. ABC is better than XYZ, on this given night. Tomorrow who knows.
I know because I have played than game for years with almost every radio made since the 1950’s .
But …. Since you asked. I sold about ten stations a few years back, since it dawned on me I only use one rig at a time, and need a backup in case one stops working. In 2018 I purchased a used Flex 6500 and then added the Maestro remote head unit, and made myself use it until I understood the rig. It is a rig that takes time to understand, but it was worth it. It is the best rig “over all “ that I have ever used. That said. I got a Icom 7300, and added a Kenwood 590SG ( I know that’s three rigs ), and yes did the compare the 7300 to the 590SG. Finally sold the 7300. Then got tried of it and yes, got another 590SG, then got another 7300 ( kept it a year ). Along the way I had a FT-3000 only stayed 2 weeks. The got another 590SG, and then added a FT 5000. The FT 5000 was almost at the same level as the Flex 6500, and it had 200 watts out, but the Flex still was better. Now here it comes. A FTDX-10. WOW what a rig. What a receiver. Was it as good as the Flex 6500 yes and no. Yes in normal use, and no when the bands got tuff. What a rig. Better than the 7300 yes in some ways, but not in every way. The menu system as said before is a mess, as the FT 3000, and the scope ?? thing, was a waste. The 7300 scope for me was better as was the Flex, and even a Icom 7600. Yes one of those somehow came to the house last year.
What did I keep, the Kenwood 590SG. Was it the best maybe not, but there was never a time when I could not hear a station on the 590G that was also on the 7300, FTDX-10, FT 5000 or the Flex. In fact on CW the Kenwood really is very good. The 590SG’s fan is super quiet, can’t say that about the 7300 or the FTDX 10. The 7300 and the 590SG are fast to use control wise.
Buy one used, if you don’t like it sell it and get something else. I have never had a really bad deal with another ham.
Which one is best. Buy both and see for yourself. IT WILL, be the only way you will be happy, and know that works best for you.
Buy a radio and stop worrying if you got the right one. Buy one use it, get a good speaker, and a good set of headphones, and ENJOY it. Stop thinking “do I have the best one “. You will not be missing stations, because you purchased one over another. Todays, rigs are all great. The best rig is the one that is connected to the best antenna system.
By the way. It is very easy to add a SDR receiver like the SDRPlay to either the 7300 or the 590SG. You then have a true second receiver and a real nice, big waterfall display. Using one of several free programs you will be able to control and track the 7300 or 590SG either together or as split. The 590SG is the easiest since the port to do this is factory installed. I am not sure if the FTDX-10 can do this.