What exactly isn't so great about Safari for you? I ask because all other web browsers on iPadOS are required to use the same WebKit engine that Safari uses. For example, Chrome has to use WebKit rather than Chromium that you might be used to on the desktop version. Same with Firefox, it's using WebKit instead of Gecko. So if a site isn't working properly in Safari on the iPad, it likely isn't going to work in any of the other browsers either.
However, these other browser can provide other functionality. Chrome can sync your passwords and bookmarks to your Google account. Edge can sync your passwords and bookmarks to your Microsoft account. Some have built-in ad blocking. As far as Safari (or any other browser) on the base iPad vs. the iPad Pro...I think it's about the same. The Pro doesn't unlock any extra features.
For me...I use Safari for personal use, and Edge for work (to sync with my M365 account).