First - Congrats!
Second - My husband and I hit these same cities on our honeymoon so I can offer a bit of advice!
I would go with your Option 2. Unlike another poster I personally feel 3-4 days in London and 3-4 days in Paris is sufficient (it was for us at least). Rome has so much to offer and 6 days there are well worth it. Keep in mind though hopping from one city to another (even by plane) will likely lose you almost a whole day of travel time (getting to the airport, checking in, flight, getting from the airport to your new hotel and then checking in).
So think of it as 3 days in London, 3 days in Paris and 4 days in Rome. (I'm assuming your travel day to London and home from Rome are not included in the 14 day count?)
Also, I know with planning a wedding its really hard to dedicate time to planning a trip too. I can't stress enough how important it is to have some of the logistics planned out so you know how to get from one place to another in a city, and at least have a ballpark idea of how long it will take you to see each location on your wish list in the cities.
Don't over-book yourselves with sightseeing activities. You want the trip to fit in the big sights but also don't want the trip to feel like an exhausting marathon. Definitely schedule some afternoons to just relax and ya-know...do honeymoon stuff. When you find it painful to cut something from your wish-list, tell yourself you'll return to Europe on your 5th anniversary to see more (that's what we're doing!)
P.S. the hop-on hop-off bus tours in Paris and London are a great way to roll from one sight to another efficiently and eliminates some of the planning involved in navigating, we felt it was money well spent in both places. :)
Lastly - Have an amazing time!