X570 has more PCI lanes, but that only matters if you want to run more than one PCI-E NVMe SSD, when a typical PC these days runs none. Generally speaking they just have more of what you already get, more fast USB ports, more SATA (if they choose to configure it to maximise that) ...and also more noise because they have an extra fan cooling the motherboard.
Choosing a motherboard is largely down to picking one that has the features you need. Number of slots/ports (be it PCI-E, USB, M.2, SATA, whatever), Wi-Fi/Bluetooth inclusions, Gigabit Ethernet vs 2.5Gbit Ethernet, the quality of the onboard sound chip if you need to use it, Thunderbolt support, LED bling, etc. This tier list is based on US pricing but can give you an idea of what the more well-regarded boards in each price bracket are, plus any notable shortcomings of individual models that may not be immediately obvious, such as missing a USB-C front panel header.