Mobile proxy vs ISP proxy for Instagram. I don't see the difference

It sounds like you’ve hit the "sweet spot" where your current scale doesn't yet trigger the red flags that make mobile proxies a necessity. The main argument for mobile over ISP is anonymity and trust, since mobile IPs are shared by thousands of real cell tower users platforms are much more hesitant to ban them than a static ISP IP. Hoever, ISP proxies will almost always win on speed and stability. If you aren’t seeing action blocks or reach issues on your $2 ISP proxy, there’s really no reason to overpay for mobile right now then stick with what’s working until the algorithm tells you otherwise!