In business we always say "trend is your friend" do you agree?

Absolutely! Change is the only constant in any business environment. One must move with the current trends a.k.a. "Change".

Following  blindly on trends as friends is dangerous. Reason in business trends changes its color very fast thus In business one has to be trend setter so that by the time your competitors catch up  -  you can be on new targeted trend  and lead the market and be led.