Take a deep breath, no rush, tickets have been on sale for a month already. Any tickets available now are likely still going to be there in a week.
Personally, I'd go with section 105 (further away), because if you sit in section 104 (closer to the tunnel) you risk having the view of the corner 3 being blocked by the backboard and/or basket support. Also with the deadspace (baseline, tunnel, etc.) and where the action will be focused, I'm not sure the seats in 104 are actually closer.
But this might not even be an issue for you, are you buying only 1 ticket? Pretty sure Ticketmaster won't let you buy just 1 ticket if you'll be leaving 1 seat open, which looks to be the case in Section 105.