Reseller hosting is best when you are hosting multiple sites.
Put it this way, lets say you host 10 websites ( domains ).
Most web hosters have CloudLinux with limits of 1 CPU 1 GB RAM and 1-5 I/O Mbps, so if you have 10 websites, and all getting half of their resources u will technically get 5 CPU, 5 GB RAM and 25 MBps I/O
On a VPS, you may have 2 vcores, 4 GB RAM, and an unset disk I/O ( which most VPS would classify above 20, some 40 as *resource abuse* depending on the VPS pricing and their acceptable use policy )
If you host 10 websites of the previously mentioned, you won't havew sufficient vCores/RAM/Disk I/O.
This difference scales with the number of websites you intend to host
So, A reseller hosting would be better if you intend to host many websites.
Now onto the advantages of VPS. VPS ( KVM at least ) lets you have full control of your site ( this is common knowledge ).
But if you have one site that uses more resources ( EG. 2 cores, 4 gb ram, 20 mbps disk I/O ), most normal cpanel shared hosting will not have such high Cloud Linux limits. Hence, your side will be slower because cloudlinux limits your CPU/RAM/I/o usage ). So its better to have a VPS OR a semi dedicated hosting ( shared hosting, with less users on a server, and more resources for each account than the normal limits i said above ).
Plus, if you host another 9 websites that barely use any resources ( eg. static sites or new sites with little to no visitors ), then its better to go for a VPS
Hope this helps !
