The A3WS is a good antenna. There are better ones out there but I wouldn't think the OBW10-5 would be. The F/B is lower and it won't really have more gain. For the price of a OBW10-5 I would think you could do better with a different antenna. It is nice to have more bands though, 17 and 12 are doing good right now, 20 is okay,15 is doing good and 10 is doing well.
Hope this helps