If you have young family in school in Doha you have the benefit of choosing where you live with regards to schools as opposed to taking company accommodation. It also depends on what you want with regards to facilities. If you're willing to supplement the allowance, then for an extra QR2000/3000 you can have a very nice villa with gym, squash court, tennis court etc. On the flip side you can also find nice villas with limited facilities for around QR13,000 to QR14,000.
The other advantage of getting out of company accommodation is socialising with people outside of the industry. I don't like to talk shop too much during my days off!
Regards,
GBD