Tissue buildup? Where?
Are you talking about scar tissue? Surgery of any kind is going to cause some scar tissue to form wherever the surgeon made a cut.
In the case of the band, you'll have scar tissue at the port incisionl and scar tissue where the band hugs the upper stomach. That scar tissue actually helps the band stay in place, but if you later need your band removed (for medical reasons), the scar tissue would be tricky to work around.
I think you need to consider other, possibly more important issues, when choosing a WLS, such as its effectiveness and its effects on your lifestyle.
Jean McMillan c.2009-2013 - Always a bandster at heart
author of Bandwagon (TM), Strategies for Success with the Adjustable Gastric Band & Bandwagon Cookery. Bandwagon for Kindle now available on Amazon. Read my blog at: jean-onthebandwagon.blogspot.com