The VIPERSGROWTH (VUG) and the Invesco QQQ (QQQ) track a similar index. While VIPERSGROWTH has $89.78 billion in assets, Invesco QQQ has $207.43 billion. VUG has an expense ratio of 0.04% and QQQ charges 0.20%. Bottom-Line Retail and institutional investors increasingly turn to passively managed ETFs because they offer low costs, transparency, flexibility, and tax efficiency; these kind of funds are also excellent vehicles for long term investors.