Midnight, the River is a great glidey fairway driver. GL will be less stable, beat in a little quicker, but usually will also have a touch more glide. Opto is virtually indestructible and is usually more stable. TM is their base plastic. Will get chunks and gauges if you drill enough trees. I only use mine for open field throws.
Get and Opto and a GL and see what you like. There is a thread somewhere about the PLH and Domes on Rivers. If I remember correctly the flat GLs tend to be understable and are probably only going to be good for you for turnover drivers. My Optos seem to be more consistent than my GLs. Straight with some reliable fade. My GLs are mostly less fade, and turn easier.
Get and Opto and a GL and see what you like. There is a thread somewhere about the PLH and Domes on Rivers. If I remember correctly the flat GLs tend to be understable and are probably only going to be good for you for turnover drivers. My Optos seem to be more consistent than my GLs. Straight with some reliable fade. My GLs are mostly less fade, and turn easier.