Trump = fashist, Kamala = communist
I can see how on the surface level, this feels like a tit for tat, each side calling each other names, but there is a significant difference here. The difference is, of course, that Trump fits the dictionary definition of a fascist and is emulating the most famous recent one, even pulling quotes direct from his speeches. His Madison Square Garden speech last night was absolutely bonkers, and was intentionally set up to emulate a 1939 rally in that same venue held by the Nazi Party of America. By no definition is Harris a Marxist or communist, but the right calls her one so that they can claim it's just turnabout when they call Trump a fascist.
Sure, there are differences but the US has experienced 4 years of Trump and 4 years of Biden. Country is still standing and the difference was not that big.
More Americans died under Trump than at any point in history. Yeah, COVID's fault but he exacerbated it significantly with his actions. And after he left office, more and more info has been coming out about how he was prevented from doing some pretty heinous things by his closest advisors, the same ones who call him things like "unfit for office", "idiot", "imbecile", "fascist", etc. He was prevented from deploying the US military against US citizens by his security advisors, among other things. And if he wins, his explicit plan, one he's said openly, is to make sure he's surrounded by "loyal" people who will do what he want. Trump has been saying what he wants to do differently if he's elected again, and every single one (arresting and executing political rivals, pulling broadcast licenses for media that criticizes him, mass deportations of even legal immigrants) is a significant step towards more open fascism. This is of course leaving aside what his team is doing to undermine the election, which is yet another fascist move that he tried less effectively last time already.
And finally, the US economy has grown insanely since Biden took over. The worldwide recession hit us a lot less severely than the rest of the world, and we've recovered faster than the rest of the world. Record job growth, new infrastructure improvements, the world's first TSMC chip foundry outside of Taiwan to protect critical microchip supply, etc. When people say they were better off 4 years ago, they're usually talking about gas prices (which were low because COVID) and grocery prices (which are high in the US because of corporate price gouging, not inflation). Trump also signed us up for more long-term debt than Biden by a huge margin.
To say that things were not that different under Trump and Biden, and wouldn't be that different under Trump or Harris is ignoring the nuances of what happened under each, or what their plans are. Just because Trump was ineffective in executing last time doesn't mean he didn't try, and trying should be enough to disqualify him, especially since he's openly saying what he plans to do differently so that the next time it works.