Windscreens are just too subjective. Everyone is right and everyone is wrong. All depends on what you want at the time. Is it hot or cold, headwind, tailwind, or crosswind, riding fast or slow in rain or snow?
The Madstad definately gives the best protection on the Tiger, but sometimes it is too much protection. It has great adjustability and (on the Tiger) the "lowers" can be added for even more protection. The downside of the Madstad is that it is huge. You can feel the wind resistance when you ride.
Neither the Madstad or the Givi looks cool if that matters to you. I once heard someone criticize a lady's Madsatad and she replied "it looks good from where I sit".
Lastly how does the stock screen work for you? Oh, sorry, you haven't tried it yet. I've found I don't get the right one on the first try sometimes.