I cannot comment on either as far as the fishing goes...I was out at ferguson earlier this year. if you launch your boat from a trailer, both boat ramps are very primitive and the one at ferguson is very steep. good luck
I've caught more fish at Metzger, so I tend to fish it more...which isn't a fair assesment of Ferguson. I've caught good fish at Ferguson, but always on the west and south banks and around the cattails on the east bank.
The only bank that I've not caught fish, in Metzger is the southwest corner and I'm not sure why. It seems like anything south of the pump house and going east along the south bank for about 300 yards, seems to be a dead zone.
I troll when I fish Metzger and most of Ferguson and seem to have my best luck in 10' to 16' of water, while paralleling the bank. Right out in the middle of Metzger you can catch white bass, in the warmer months.
I agree with deskunkify, about the boat ramps. A 4x4 would be best, due to the steep banks and loose gravel. I use a kayak, so it doesn't effect me.
Ferguson Is by far the better of the two. The boat ramp is tricky/dangerous. Make sure to leave your front tires chalked at the top. there is a cement curb there to do so. The ramp itself is just ground and small ground up stone. When the water is low, you should launch only if you can lift your boat off the trailer at the bottom. If you reverse your vehicle past the curb, you could as many have discovered, your inna real pickle. The angle of the ramp vs the ground style base is not conducive to an easy safe procedure.
Metzger ramp is not a walk in the park either. The ramp runs alongside the bank and angles down. The gravel is softball sized and ground stone mixed. If your tires get into the softball gravel they will sink fast. Make sure you are lined up for a clear path that you check each time. I would rather chalk the curb than to fight Metzgers gravel.