I run both Tekin and SP/HW and they are all exceptional esc's and have been using them for well over 2 years now.
They have both had there developement gains in that time with much success going to Tekin due to it being a US company, raced in the US and being more popular in the US.
For support especially in the US Tekin is tops but internationally that is not necessarily the case.
HW however is simply the best value for money and performance and actually opens ones eyes to the fact how other brands that manufacturer thier esc's in China make thier money with exhorbitant pricing but yet still dont have the quality and reliability of HW.
Yes HW has a hassle with support but seeing the growth and popularity of the Xerun esc's that is definately changing.
You can post esc's to them for repair and depending and what is wrong it will get replaced or have a small charge.

which ever way you go will not be a bad decision and you will have a great product.