Price is the sameTNX
Which is better to start?
i did some research and i will try to rank with 4-5 longtail kwds (with 4-5 articles)
so is it better to buy dropped 15yrs old domain or new but exact match one (best keyword)?!?
If it's dropped then it's pretty much useless. It's just like buying a brand new domain, maybe even worse since it was registered previously and therefore it may be devalued.
The importance of the EMD while indisputable now, will some day be devalued as time goes on. That does not make it less valuable right now, but an aged domain that has expired, not been dropped, and isn't banned will in years be a tremendous authority site to create backlinks from.
If Google devalues the EMD (and they probably will in my opinion) the power of the EMD will diminish or disappear. An aged domain will always be there and continue to build authority.