The first one is a red honda and the second an orange echo.
you can google these two tillers and pretty much get hundreds of opinions.
I prefer a rear tined tiller anyway.

Another difference is both of them will ruin your soil for 3 years. NEVER rototill soil in preparation for growing grass. When the fluffy soil finally settles, 3 years later, it will leave the surface bumpy. Then you have to jump through the hoops necessary to level your soil while there is already grass growing on it.