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Funny you should ask this question. I have just gone through this process after having a side by side system for a couple of years. With the help of many people I came to the realisation that the side by side was producing differential flexure. I changed it to a piggy back system and now seem to have the flexure under control.
Having said this, I see a lot of great images with side by side systems. Why my system would not work correctly is really a mystery to me, but the bottom line is that I found that piggy back was better. It can be an expensive mistake to make and all I can offer is that piggy back does more often than not come up as having less flexure than side by side.
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