Depending on complexity of treatment,  it may take anywhere between 8 months to 2 years. Branded braces are definitely better than the cheaper duplicates from china. The treatment and movements are predictable and results would be good. Ceramic there are two types one that chips and another that doesn't chip bit it's much more expensive. Whatever bracket you have, you must take care of your diet else they may debond or come off loose from your teeth since the cement gives away.  Ask your orthodontist for details

For any braces treatment it takes around 1.5 to 2 years for treatment whether it's metal or ceramic braces. Using 3m braces rather than any random one will always have advantage .. There are always a possibility of breakage for ceramic braces ..if not being careful