Jp576:
What's the better option, 2 cheaper weaker aps i.e 2x uap ac lite vs 1 stronger more expensive ap like nanohd.
Or 2 tp link eap245 for 400 vs 1 ubiquity nanohd for 300+?
That's not a question that can be answered. You can't think of AP's simple as "weaker and stronger". There is also no "better" option.
Every single one of those AP's has very different characteristics and different usage scenarios. The most significant difference between them all is the number of chains, and without knowing what your exact WiFi requirements are - ie do you need 4x4 or is 2x2 sufficient? What are your throughput requirements? What bandwidth will you be using (remembering 20MHz will give you waaaay better coverage than 80MHz @ 5GHz) and so on.