Basically I had two great opportunities one in a big research organisation and other from a fast paced startup. After some thought and a bit of intuition I though to join the first one but within couple of days I came to know that they don't take software development much seriously and the environment is a bit relaxed. They don't follow any code standard or style guide etc. maybe because the organisation has its main focus on research. The environment is quite relaxed and so the reward/appraisal.
So, I am feeling a bit stuck because these are the things that you learn after joining only. On the other hand I am now actively looking at the Github repo of the startup and I feel that they are more into latest technology and fast paced development where I can learn much.
Its only couple of days since I joined here and I still have option to join the startup. What should I do? if I finally make my mind to join the startup then how should I quit from the current one? should I make up some family emergency situation?
PS: Both are from two different countries.