Hi there!
I will admit, I haven't tried Transformers - I wasn't aware there was a more updated version than the old Transformators mod. I will have to give it a go!
The transformers in my mod allow manually specifying the priorities of the inputs and outputs, so they are usable in more cases than the old ones. For example, in my current Py run I am using transformers to ensure power generation from burning byproducts is always fully active even when the other power producers in the base are sufficient; I'm also using transformers to run electrolysers with only excess power to avoid crippling the rest of my base's power supply.
The transformers do work differently internally too - I'm using a simpler hidden entity setup, just 2 hidden electric power interfaces with an on-tick method to transfer power between them. Slightly worse for UPS, but I don't imagine many being present at a time since they have infinite throughput, so still negligible imo. They're also missing the copper wire attachments - I'd like to add that at some point, but I couldn't find a way to prevent the transformer working when they're not present, so they seemed more confusing/unnecessary than anything else.
This mod page needs some screenshots of the transformers in action - I'm planning to get some taken and uploaded soonish. I want to get some more playtesting in with them first before I start advertising properly.