Job Offer in Abu Dhabi...is it worth it?

Hi Fadyl, the cost of living in Abu Dhabi can be steep and your ability to save would, as you have already mentioned, all depend on your own lifestyle, as well as what benefits are offered along with your basic salary. Accommodation is likely to be your biggest expense. Transport is another thing you would have to consider as public transport in Abu Dhabi is far from comprehensive, so you may have to consider buying a car.

Check out our Cost of Living in Abu Dhabi page for a breakdown of what you can expect to pay for all your basics in the emirate.  If you're still in the position to negotiate the contract terms, you can read our Expat Contract Negotiation page, which will give you some great tips about what to consider in trying to get the best deal you possibly can.

We've had a number of similar questions recently - you can follow the comment threads here and here.

Good luck with your decision!

If you're not sure anymore about KSA, I'd say move. I now people in AUH leaving a pretty decent lifestile and saving with both their eranings combined to aroung 27-28 K AED, so you should be fine, even if your wife's not working. 
Food and cloths costs in Abu Dhabi and KSA are very similar, and the currencies as well. So if you've lived ok, you'll probably be better off in Abu Dhabi, with the peace of mind that your movements are more free, and the life is more relaxed.