hello forum members,
                                       i would like to know whether do we have any difference between common brands like emax,turnigy etc and STANDARD MOTORS like T-MOTORS and SCORPION???
if so what is the difference?
definitely i think you would say about life time,but do we get any change in flight time???

A very nice thread indeed.

I think these brands differ mostly in terms of build quality. Smoother bearings and quietly rotating motors are what the multirotor community wants now.
Obviously with smoother motors, you get better flight characteristics, and there should be a slight improvement in the flight time as well.
However, threads are floating around saying, if you're buying any motor above $50, you're only paying for a rebranded, re-stickered $30-ish motor. I wonder to what extent this is true.
But in the end, the build quality matters very little to a hobbyist seeking mere fun. (Not a prof. FPVer or an APer) Selecting the right motor-ESC-prop combo with good FC tuning is what it takes.

Sorry but I am answering only as a multirotor guy.
I'm curious to know what the seniors have to say.

thats right hyd_quads!!!!
i was wondering by seeing some posts in the same forum claiming more than 36minutes flight time with T-motors(quadrotor)!!!!
how can this possible with a 2.2ah  battery???
little bit cunfused as well curious to know the secret behind this wonderful flight time!!!!
as well im sorry ,iam not raising any doubts on others builds!!!!

That can be true. T-motors are kinda known for their 'ultra-smooth' working. I don't know if 36min is possible with 2200mAh, but some have managed around 20-25 min.

I don't think there's any big secret behind that flight time. Maybe just a perfect combination of quality of motors, right prop size, minimum weight (remember?, his frame was all carbon-fiber) and good flying techniques (no rapid throttle, just hovering around, etc.)