I know a number of students who have attended Boston College. I think from their perspective they would say it’s a welcoming place. That being said, if you’re going to transfer as a sophomore? Or junior? There are some things to consider. First, check how many transfers, they accept. If I remember correctly, I don’t believe they take many transfers each year. Are you looking at other schools? In addition to Boston College? If you’re only applying to this one school, your chances of being able to actually transfer are significantly reduced.
Another factor to consider is the housing situation. My understanding is that Boston College guarantees three years of housing generally. I believe for transfer students they guarantee one year of housing which means that you could be required to find off-campus housing for one or two years if you transfer in as a sophomore.
Lastly, are you aware that Boston College has a fairly significant core course requirement? The only reason I bring that up is because some students find that unappealing or difficult to complete depending on which year they’re transferring.
This might also provide some additional information for you.