We recently installed two Panasonic fans in our master bathroom, 1 x 150 CFM (main bathroom) and 1 x 80 CFM (water closet). They work splendidly and are very quiet. Also economical (cheap!). I highly recommend Panasonic.

I've sung the praises of Fantech here many times. It has unbelievable power to remove the moisture and is virtually silent. Really! I also like that it can be installed right in the shower; I purchased the dual vent with one in shower and one over tub.

So now you have recommendations for both.

Both brands are fine.

If you go with an inline fan, you can usually get higher CFM and have it be virtually silent due to the "remote" nature of the inline fan.

With your bath having moisture problems, two grills feeding a single inline or two individual fixed fans may be better than one. Depends on your bath layout.

Consider putting the fan on a timed fan/light switch. Turn the light switch on and the light and the fan turn on. Finish showering and you turn the light switch off. The light turns off but the fan runs for a predetermined time to aid in additional moisture removal, then the fan turns off.

Pay close attention to duct lengths and turns in the duct. The CFM-rating for a fan can be drastically reduced with excessive duct length, bends, any kinks, or for non-smooth flex duct.

For a problematic bathroom I'd recommend an inline fan.

We recently did a bath addition/reno. We installed a Fantech inline with dual grills. One is in our toilet room and the one over our shower has a light in it. We have 300+ sq. ft. in our Master bath to ventilate. We have a big Bain bubble tub and a large shower. We never have any condensation in the room. We love the fan, as it's quiet. I would go along with mongoct's recommendation to install a timer on the fan. It's so quiet, I often forget to turn it off. Good luck with your decision.