questionswhat is the best tv wall mount with side to side…

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I don't have a direct answer for you, but starting at Newegg's best reviewed mounts has worked for friends: http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&N=40000696&IsNodeId=1&Description=vesa%20mount&bop=And&Order=RATING&PageSize=20

Make sure to check the weight ratings.

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What size TV are we talking here? Depending on the TV size/weight I found these full motion mounts over at Crutchfield, not the cheapest place to buy from, but they should give you a starting point.

For up to 27"/50lb: http://www.crutchfield.com/p_051SF203B/Sanus-VisionMount-SF203.html?tp=1416

37"-56"/150lb: http://www.crutchfield.com/p_051VLF210/Sanus-VLF210.html?tp=1416

And if money is no object, the motorized wall mount: http://www.crutchfield.com/p_051VLF210/Sanus-VLF210.html?tp=1416