I've had wonderful connection in my life with both people in person and online.
Online relationships have only been something I have engaged with in the last 5 years or so, but if I calibrate for those differences of time, I think there is little difference in the real life vs. online number of people I have opened my soul to and have received the vulnerabilities of in return.
I think there are differences with online friends and real life friends. I find it far easier to find people online who share my perspectives and interests. I generally find I have to work less to find common ground with people online. Perhaps this is because I meet them in online places where there is already shared interest. In many cases, I find it is easier to share deeply with friends online. This is perhaps because there is that common ground to start from, but perhaps it is also because of the unknown space surrounding an online friend. I wonder if there is a temptation to mentally create fantasy friends around the limited template of what a person can present in the internet medium.
I think online friends can be as important as friends in real life, but I do personally think it has been healthiest when those two worlds were brought closer together through phone calls and in-person meetings.