Help With a Question

Now I have been stitching for almost 20 years now, but now that I have entered blogland and have met and seen such wonderful stitchers, I would not consider myself an experience stitcher. I have been stitching the same way since I was 15, and I am just learning now, new techniques and about finishing's. I am experimenting now with different fabrics and fibers and I feel like a novice.

My question is..... if you are stitching on a 28 count linen or cotton evenweave fabric, would you use 2 plys of floss or 3 plys? I have always used 2 plys, but I sometimes don't like the coverage. I'm worried that 3 plys would make it a little harder to get nice even stitches (although, mine aren't always that even). Any suggestions would be appreciated.

Right now I am working on Little House Needleworks Ornament of the Month, "Red House in Winter" and with all the dark colors and the light linen, I am not happy with the coverage of my 2 plys of floss. I have way to much finished to frog it out, so I am continuing and hoping I will like the finished product. Pictures later.
Happy Stitching,
Hillery