I have a m11x and want to buy a new one, which advise me M12s or 4PX.thank you

m12s is a tick faster, just the slightest more "connected" feeling. The ergonomics on the 4px are vastly superior. For me, the 4px was an easy choice.

Once you're in the deep end of the radio pool, it will really just come down to the "feel" of it in your hand and if you have a preference there.

I'd go with the M12s even tho the 4px may look tad 'cooler'

4PX for sure
I love how firm the wheel foam is!

If your comfortable with the m11x, then the m12s will feel right at home for you.

But like many have said, go and test out both controllers and see which one feels better in your hands.

For me I liked the 4PX feel the best (make sure to change to a smaller trigger unless you have fat fingers). The menu system is also more easier to navigate. The M12S is supposedly the fastest radio on the market but was not as comfortable as the Futaba.

As if you can notice the 0.7msec difference in frame speed.....

go with the 4px for a quality radio. . you can also get good aftermarket receivers in s-fhss and fasst c2 flavors from hobby king banggood, and other vendors. brands like corona, cooltech, orangerx, frsky, etc.

Or you can buy the Real Futaba recv for $50 r304sbe, best for 4PX

Or the non telemetry version for 35 bucks. Sanwa receivers go beyond the $100 mark...

if you have a bunch of models go with the aftermarket ones

Never said I personally did, although some people claim to.

Some have reported issues with buttons and the pots in the 4px. I loved my m12 and love my m12s.

I hated my 4PX, loved my 4PKSR.