Given that I'm going to T1, I'll have heavy bags, and the RER B is doing all sorts of new and interesting things this weekend, I think I will finally opt for the bus.

Opera and Gare de Lyon are almost equally convenient/inconvenient pick-up locations for me - is there any reason to prefer Roissybus or LCAF No. 4?

EDIT: This will be around 8 am on a Saturday. I assume there is no significant difference in traffic.