what is the best tablet for IT professional?

I am an easy tech associate at staples I know not much but on the side I actually preform:

Network security and maintenence
Data retrieval and back up
Diagnostics of machines
Hardware and software troubleshooting

So I was wondering what would be the best tablet for me in terms of I will need expandable storage and possible be able to run Lubuntu, and does any one if anyform tablets have master slave support for burning iso’s to discs