Thats a hard one to answer. I have an 8x32 FL and I have looked through the Conq HD several times. The HD does 95% of what the FL can do and is considerably cheaper. It even focuses a bit closer than FL. Its a very compelling instrument and anyone would be delighted to own one.
What does the FL do better? Well its a bit brighter, it has better control of chromatic aberration (thats the colour fringe some people can sometimes see when viewing dark objects against a pale background) and the FL is about 100g lighter.
You really need to have a look through both at the same time to find out which suits you best. If you are not sensitive to chromatic aberration (BTW the HD has good control of this, just not quite as good as FL. I didn't notice CA in normal viewing through the HD) and don't mind the extra weight then the HD is a no-brainer. I would have one if I didn't already have the FL.
The cleaning issue is a personal one: everyone has their own technique. I always brush off dust first, then use breath and a micro-fibre cloth, and anything that won't clean off I then tackle with lens cleaning fluid and a cloth. I have never marked a lens with this technique in 30 years but no doubt there are loads of folks with different techniques who can say the same.
Good luck and let us know what you decide
Lee