For ease of use you can't beat SunPass Pro linked above (or any State EZPass now).
We upgraded before our March trip and it was great. We were able to use the express lanes along the I-4 or detour on the 417 around Orlando, we used it for the express lanes through Charlotte, and it was accepted for the bridge tolls at Thousand Islands Bridge. The reduction in tolls for transponder use covered the cost of the actual transponder fairly quickly. It was easy to order online, and arrived in a bit more than a week (even during COVID). The postage on the package was around US$12, (delivery included in the cost) so they aren't making any money on this!
The selling point for us was being stuck in slow traffic through Charlotte on the Sunday drive home and being able to slip into the nearly empty express lanes. Zipping past all that traffic was priceless!