A three turn surgeon's knot will give a stronger connection than a two turn knot and is stronger than a blood knot.

For a near 100% connection create a loop at the end of your leader with a non-slip mono loop knot and put a bmini twist knot in the end of your tipper. The bmini twist will leave you with a 100% loop in the end of your tippet which can be looped to the leader. This will give you a 100% connection with respect to the tippet strength. But since you don't want the 'bulk' of the loops, the three turn surgeon's will likely be the best option.