Yup, I've got a Cera and only use it with herb.
The miniVAP seems like a great vape from all I've seen and read. It is a very different vape from the Cera.
The miniVAP contains electronics and regulates temperature for you. You have a few temperatures to choose from.
Cera on the other hand is all analog, that is there's no electronics or digital automation. It is all manual and controlled by your breath speed. Some see this as having more control and others see it as having less. In theory, the lack of electronics should point to greater reliability and longevity. I haven't heard about any problems with the miniVAP; I'm just talking about betting on the long term.
Another big difference is that the Cera uses modular cartridges to vape different materials, so for an extra $100 on top of the full loose leaf setup, you can have the best oil vape available.
They are also very differently sized. The Cera comes close to the pen form-factor, though at a 1" diameter it's more like a real fat cigar. The miniVAP is portable but a bit large to be pocketable.
The Cera also gives you the option of carrying as many spare batteries as you want at a much lower cost than buying multiple miniVAP battery modules,
There is a larger learning curve with the LL Cera than you'd have with the miniVAP. Thanks to the electronics things should be easy from the start there, while the Cera will take a bit of practice at first. I find that process rewarding, after going through it with both the MFLB and the Cera. I like the experience of using a manual tool to partake in my herbs; it's all part of the experience for me. I liken it to learning to play an instrument. Once you begin to develop technique, you form a connection with the instrument and the barrier between you and whatever sort of performance you feel like begins to fade away… But I only speak for myself, I know many would call me crazy and reach for digital temp regulation every time. To each their own!
One other thing to consider is customer support. TET is renowned for theirs, and if you're based in the US you'll have access to quicker and cheaper shipping should you need warranty service. I don't know much about customer support at Hermes, so maybe a miniVAP owner could chime in there. I believe everything I've seen in the miniVAP thread has been positive.
Both vapes have top-of-the-line performance and flavor. As far as answering "is the cera better for herbs than the miniVAP", it comes down to what's better for you and your wants/needs, and how much you want to spend. The herbs will be happy either way.
If you do prefer electronics, I'd also take a look at the Ascent too if you haven't already. It's due to be released soon and offers digital temp control and use with oils. Early reports seem to show that it is less of a pure convection vape than the Cera or miniVAP, but it still looks nice. Should be a top performer for flavor, like the Cera and miniVAP. Only three people here on FC actually have one yet though, this is all early reports and little speculation.
Sorry for the long answer! Hopefully something in there helps.