I agree that both are good guys. SJS has competitive prices and shipping is very reasonable. I wanted a pair of new nuts for the output shafts of a 352 transaxle. SJS didn't normally carry them, but got them from mainland Europe for me. Shipping was $21 to the US for the pair. I think Renault16shop in Netherlands wanted something like $60 to ship one.
Emails to SJS don't always get answered, but calling them is very effective, and they respond well to personal conversation.
I've dealt with Ray at R.D. Enterprises for a long time too. Many of his parts are priced very reasonably and competitively, so you should always check. Responsive and a good guy.