With so many options when it comes to conservatory roofing, it can be quite tough to work out what the best option would be. For example, I got a standard flat roof installed on my conservatory – and I cannot tell you how big a mistake that was!
Personally? Look as closely as you can at tiled roofing. There are various tiled conservatory roof systems & replacements (https://hipco.co.uk/tiled-conservatory-roof-syst...) that you can look into if you are looking for something a little different. Roofing is so important that I recommend you speak to a professional and find out as much as possible about your options before committing to anything.
At the very least, avoid a flat roof for your conservatory. Tiled roofs look and operate the best.