This is likely to be a long discussion. I'm sure everyone has their own preferences and reasons - I prefer the Stillwater and a few choice tribs over either.
It is a nice problem to have to choose between so many productive fisheries.
Oh, and I would say the GMR if I had to choose between the two - it's closer.
I would say which ever one you have the time to get out and fish. The better you know the river the better you chances. I prefer the LMR but I work on and live near the river so it is a natural choice for me. With limited time we all have these days pick which ever is closest to you and learn it. I agree with all the previous post that the LMR best numbers and GMR for larger fish. As bsm stated the creeks are always a good bet but big fish are rare and should be consinderd a great catch and released unharmed. Good luck. S
I like the one with water in it that day!!! All rivers that hold smallies in them I like equally, I only fish the LMR the most due to location for me. If I were in Troy or Sidney, I would prefer the GMR, If I were in Warren Co...and I am.. I prefer the LMR.