If you are talking to a blind supplier they will always tell you that you need conservatory blinds. We think this is again a budget driven decision.
Why not check out the price of blinds especially roof blinds and then compare it to upgrading to a glass roof, we think you will be surprised.
A good glass conservatory roof offers great light / solar glare reduction, will keep you cooler in the summer and warmer in the winter.
It also gives you that great sleek modern look that will last for years. Side or frame blinds are a totally different option as these are mainly chosen for their looks and style rather than their properties.