Rick,
I'll just give my experience with markers. I don't know how others are fairing. I bought some Pantone Letraset markers at my local art supply store over 30 years ago (recommended by Poul Jorgensen in his book) . Re markedly they still mark well. The advantage I see in shopping at the art supplier is color selection. The markers can be purchased individually instead of finding unusable colors in a set.
I have noticed that some synthetic material takes the marker better than others, so you need to experiment to find out if the material you want to color will make fast with the marker. The colors look good until they are fished for awhile, then fade.
Others will have their say. Have fun making your decision.
HW