OOKLA speed tests in real world signal situations, which are the ONLY speedtests that matter to me. The iP6 can't hold a candle to my Moto X in terms of how fast it can download and upload to the 4G LTE network. That is what matters the most to me not some laboratory test.
Also, the iP6 cannot hold onto the 4G LTE signal where it is weak as well as the Moto X. I can't tell you how many times my mom's iP6+ shows a 3G signal where my Moto X is holding onto a 4G LTE signal. For AT&T or TMobile with HSPA+ that might not matter much, but with Verizon, it is HUGE as Verizon's 3G network is painfully slow, almost unusable for data.
I've had decent luck with my 6 holding onto LTE. I hear what you're saying about Verizon 3G, it's dreadful.
One of my best friends has a moto x I'm going to start comparing them side by side especially when I see 3G.
Motorola radios have always been pretty good. Neil Armstrong's "one small step for man" speech was over Motorola equipment. They should be pretty good at it. It's good to see the change of hands of Motorola mobility hasn't effected their quality in that respect.