Like almost everyone I have tried several connections. One I like is to put a loop in the fly line. Use your bobbin and good thread. Trim the end of the fly line for a flusher fit. Wrap the thread around the arms of your bobbin to tighten it up. Wrap it around the line to form a loop. Lay a loop of thread to pull the end thru the wound thread. Glue it up. Takes a little time, but it is a nice connection. Be sure to test your loop so it doesn't pull out. Use bright thread, sort of a strike indicator.