For the most part they all 3 are designed to be 'integrated' into an existing store / shop/ PoS they are not stores in a box, more like a credit card terminal.
All of them can be setup to work with WooCommerce / Shopify / BigCommerce /many others
So depending on what you are using it with would more dictate what else you need in terms of hardware.
Unless I am not understating what you are trying to do.
-Dave
Hi.
Yes I understand what they are. What I want to know and maybe take advantage of other's knowledge is about other solutions that might worth to mention or research about that can fit a simple and superficial presentation about the subject. I want to let local merchants know of these solutions, show them that, if they are interested, they can easily integrate LN payments in their businesses, etc. But I don't want to go too technical because that usually tends to scare people away. And I want to be as inclusive as possible, so if younger entrepreneurs can get along easier with the new techs, probably elder people will struggle way more, so I want to "keep it as simple as possible".
I have already watched the tutorial video about that offline LN payament terminal that was posted here in this forum but that is probably a bit overkill for a first approach on an un-educated (this word probably doesn't even exist
![Smiley](https://bitcointalk.org/Smileys/default/smiley.gif)
) audience.