Unless I knew that I was really going to need a quick nap in the J suite, I'd stick with the E175 too. Boarding and getting off is faster, the J seats on the E175 are just as comfortable as the 763 suites are for a day flight, and the window views are better. Select 1A, 2A or 3A and you'll have a seat that is both window and aisle.
And just in case you folks aren't yet sick of being reminded, don't miss the AC power outlet underneath your Embraer seat!