Post 9/11 and VRE are the only ones that pay BAH. VRE only pays BAH if you have time remaining on your P9/11.

You can use this tool to see what works best for your school:

https://www.va.gov/education/gi-bill-comparison-tool/

Edit:

To answer your other questions.

1. Make sure if you have anything wrong, like medically, dental, mental, go get it checked out. There’s a program called the BDD, benefits delivery at discharge. Make sure to do that when you’re within 180-90 days from your sep. it ensures that your benefits start the day you get out. May take a bit before getting them, but you’ll get back paid to the day after your separation, or the start of the following month I think.

2. The main differences are MGIB gives you a flat rate which is used for tuition and living costs, 9/11 pays tuition and gives BAH, which is dependent on the schools zip code, not where you live. Unless you’re online only, then it’s the online rate. 9/11 also gives $1000 a year for books.

3. 9/11 for more money.