I only own a GSO dob so I can't make a recommendation on what to buy, only on what not to buy, the GSO rusted instantly, the mirror coating is average to say the least, the dob mount is chipboard and absorbs moisture, the AZ mount is sloppy and hard to use, requires modification the day you pick it up. I have spent many dollars and hours re-manufacturing it to a point that I am now happy (except with the rust) but sure can not give the unit any praise.