I think they are both going to be much for much in terms of performance. Both more capable than most of us need them to be and both capable of world championships etc.
The thing that swayed me was the lack of need for a setting box (another $70) for the LRP vs Orion and the ability to buy the LRP as a package with motor. Essentially, I got the flow works, USB and motor for the price of an R10 with the setting box.
Both manufacturers support them well with updates (you'll need a USB link for $30 with the LRP)
If you're running multiple cars (and multiples of the speedo) the setting box price is less of a factor.
I find the LRP works exceptionally well with their own motors too, even when just in blinky. My car is pretty damn quick at my track (in a straight line at least - ha!) and when we put my x20 in a mates car with a hobbywing speedy, he didn't get quite the same acceleration or top end. Different chassis and battery, so may have been other effects.