Coverage: At present, 4G network has wider coverage because it has been constructed for longer period of time；In comparison, 5G network coverage may be smaller as constructed time is shorter, especially in some remote areas

Device compatibility: Since 5G is newer technology, not all devices support 5G network so you’ve to make sure that your device support 5G connection before use it.

Spectrum Utilization: 5G utilize a wider range of spectrum, including millimeter wave bands which can provide higher bandwidth and speeds, but 4G is mainly concentrated on lower frequency bands.

Network technology and speed: The most obvious difference is network technology. Sim based router 4g use fourth-generation mobile network technology (LTE), while sim wifi router 5g use fifth-generation mobile network technology (5G). The theoretical maximum speed of 5G network is faster than 4G, it can provide higher download and upload speed, as well as lower latency.

Capacity and connection density: 5G network is designed to support more devices connecting simultaneously and provide greater network capacity, this is beneficial for IoT applications and scenarios where a large number of devices to be connected.

Speed and bandwidth: 5G network speed and bandwidth normally higher than 4G, this means that you can download and upload files faster, stream high-definition videos, make real-time video calls etc. under 5G network, speed performance is also more stable under high network load.

Latency: 5G network generally have lower latency than 4G, and this is very important for applications that require real-time response such as remote control, virtual reality and augmented reality.

Overall, sim wifi router 5g offer better performance than sim based router 4g in terms of speed, latency and connection density, but may have some limitations in terms of coverage and device compatibility. When you want to choose a router, you’ve to consider network coverage in your area and whether your device support 5G connectivity or not.