[nas]

The big one for me is that LEDE uses a recent kernel. DD-WRT and Tomato use the kernel that was provided by the hardware vendor. They have an easier job to get things running because most hardware vendors have some crazy (perhaps binary only) kernel modules.

When buying hardware, look at the LEDE hardware support list. Recently I have bought a TL-WDR4300 (get right version) and a Buffalo Airstation N600 router. LEDE runs good on these and the router has enough flash and RAM. Running hardware vendor firmware is not good, IMHO.