Investors might be better off waiting for a better entry point on Twitter stock that its initial public offering, Dan Nathan of RiskReversal.com said Wednesday, a day before the microblogging site goes public.
"It could be a bubble in a heartbeat," he said, "Everybody went in big" with Facebook's initial public offering, which was followed by a downward trajectory for the stock that lasted months, he added.
(Read more: Stay away from Twitter, advisors say in survey)
"I think those advisors are correct," he said. "There is going to be a lock-up. Remember, people, this was a huge overhang for Facebook for months and months."
Because Twitter insiders are allowed to sell their shares over the coming months, the stock could be a better buy down the road, according to Nathan. "These could be the opportunities if the thing languishes over the next couple of months," he said
Stuart Frankel's Steve Grasso offered Facebook as a cautionary tale.
(Read more: Twitter not really like Facebook: Pro)
"We were all fooled on Facebook," he said. "We thought it was going to be the next Google. It came out. They recommended it. The stock lost 30 percent of its value within just a couple of days, 60 percent in months. So why would they want to recommend this one?"
Mike Khouw of Dash Financial said that there was potential upside because the float was much lower for Twitter's IPO than for Facebook's.
"This is a situation where I'd actually expect the stock probably to trade up significantly, and you'd be very foolish to chase it here," he said.
(Read more: Bull market has 5 years ahead of it: Tom Barrack)
But the fundamentals don't support a much higher Twitter stock price, Khouw added.
"You take a look at what the analysts from the banks who are actually on the deal are forecasting from the stock. Growth numbers are significantly lower than the analysts from banks who are not," he said. "I don't see any reason why you'd want to go in and put in a market order to buy this tomorrow."