One has a fake "Forgot credentials" button that will invite people to go to their provider's app if they forgot their creds. Makes it seem a bit more legit and shows off the capabilities of such portals.
The other doesn't have this option, simply

!! Some country-specific portals also exist in their countries' language !!

How to Use

If you do not know how to use this great app which is Evil Portal, watch Talking Sasquach's tutorial here.
In a nutshell, after installing Evil Portal on your Flipper (can be done easily through flipc or even on the official App Store):

Open QFlipper
Browse to SD Card > apps_data > evil_portal
Upload the ap.config.txt and index.html file from the portal you want to use YOU ONLY UPLOAD THE FILES FROM THE ONE PORTAL YOU WANT TO USE AT THAT POINT IN TIME! Unfortunately, you have to do this every time you want to switch the portal you use.
Start Portal in the Evil Portal app using a WiFi dev board (official or not, doesn't matter)
The portal you will see by connecting to your access point will be the one for the provider you uploaded the files from!

Customization

If you want to change the Access Point's name, you can do it simply by editing the ap.config.txt file. The text in there will be the AP name.
You can also tweak the indexes a bit if you know some HTML. There is some Javascript on the "ForgotCredentials" files but nothing even a noob can't handle.

Happy flippin'

Some of the portals: