For the past five quarters, Google hasn't topped expectations and it isn't expected to report an upside surprise in the latest quarter, said Lou Basenese, founder of Disruptive Tech Research, a research and investment advisory firm.
Mobile advertising will be a key point of interest for investors anticipating Google's earnings report, Basenese said in an interview with CNBC's "Tech Bet."
Shares of another online tech giant, Amazon, could be in for a pummeling if it doesn't meet or exceed expectations, Basenese wrote in an email. Investors should simply keep their eyes on top-line growth, he said.
"Buying into Amazon has always been buying into that promise of future profits," Basenese said. "Not profits today but profits tomorrow."
Separately, Microsoft investors should look out for news on the PC market when that company reports earnings. Despite its moves in the enterprise cloud business, Microsoft still depends heavily on PC sales, Basenese said.
If an investor had to pick one of the three however, Basenese said he would choose Google.
"It's a de facto ETF on the future of technology" given its ventures into robotics, wearable devices and the Internet of Things, he said.