Smoothing before merge meshes
 

Hi guys,

I´ve merged 2 meshes; the first one is hexas mesh and the second one is a tetra mesh. I have 3x3x3 det. quality over 0.5 in hexa mesh and over 0.34 in tetra mesh. When I merge this two meshes I got a worse quality mesh. So.. my question is... Is it better smoothing meshes before merge them? Or... is better merge them and then smooth them. Or even more, is it better no smoothing?

Thank you guys!