Looking at your #2 option above, you can reduce flow restriction by doing as you say, but replacing the 3-way with (2) PVC ball valves on each line. Make the turns to the right (facing the wall) with an ELL on the left hand line and a TEE on the right hand line. 3-way valves invite a trainwreck connection which introduces substantial flow restriction at at full flow rates from both pipes. The trainwreck (or bullhead) layout can be used for ALTERNATE flow without problems.