Acess point vs wireless router

Hello,

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I have a small pension with a yard of around 600-800 square meters and I need a way to amplify my signal received via a router inside the pension via a FTP cat6e ethernet cable,cable length will be under 50-100m, I have around 15-25 people maximum outside that can connect to a wireless connection, so It's just a handful of people.

My question is: What do I get, a good wireless router or an access point, please motivate your answer since I kinda need a professional answer since I am not new to networking. Basically I need an "extender" for the router that I already have, and I am leaning toward a wireless router because I don't understand the high price that AP have with lower speed and specs, budget is around 100-150 euro.
Here is what I searched and would want to buy, feel free to leave suggestions:

http://us.dlink.com/products/connect/ac1900-mu-mimo-wi-fi-router/

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https://m.emag.ro/access-point-ubiquiti-gigabit-dual-band-1350-mbps-uap-ac-lr/pd/D0ZRD2BBM/?ref=customers_also_visited_hstr-pn_3_2&provider=gravity&recid=jl5cek8x-3rt6yf7bp6w-C.c17_a361.S.ITEM_PAGE_OTHERS_ALSO_VIEWED-1i3le10