I have used both those threads and liked both. Silk thread is excellent for strong stitches. I like EEP and do a lot of it. I took a class on Epp just to be with my friends as I thought I couldn't learn anything new about it but I was so wrong. One new way I learned was how to do the back whip stitch. It's the only way I stitch the pieces together now. I usually use a size 50 wt thread with a larger needle.