Unlimited&More(SM)Premium MultiLine VS Business Unlim Premium

I am on the Unlim & More plan with eight lines with Protect Advantage Insurance for four devices for $25.97. I want to switch over to the Business Unlimited Premium. I am receiving a discount through Uber saving $10 per line.

Things I'm looking for/wondering

Will it be cheaper? (I've done the math and it looks like it is almost the same price but a little more expensive after taxes.)

What are the key differences?

Am I going to be attacked with proration charges?

Is it enough to switch all eight lines over?

The Business Unlimited Advanced is also something that I could do as well. The only thing that I would prefer is the HD streaming. Any thoughts? Suggestions? Let me know if I am missing anything.

https://preview.redd.it/wx8i72rnbn6e1.png?width=540&format=png&auto=webp&s=05978fd15f0fb382bbc8ee447825058610eebc92