Or prevent the steam from being generated in the first place.
The most effective control of bathroom condensation I've seen yet are these perspex bubbles you install on the top of enclosed showers. Basically the entire shower cubicle gets enclosed. Because it's no longer mixing with cold air, minimal steam is produced and if it is, it says in the shower.
If you need to go with the extraction approach due to other factors like a shower over bath scenario then I'm really not so sure having an inlet fan is necessary at all. It's hard to say which one would work best for you because it depends where in the wall the fans are installed relative to where the steam is being generated among other things.
All you really need is a source of airflow to replace the air that is being forced out which will help push the steam out. Forcing cool air into the steam with an inlet fan may make it disperse and condense on the walls. It'd be best to draw it out as quickly as possible rather than potentially blow it around the room.
Get a good fan with plenty of airflow. I like larger fans as they move more air and are quieter than smaller ones. Apparently putting the fan closer to the source of steam generation is recommended too. But not right above the shower rose as condensed water can drip down on the person showering! not nice.
It's usually recommended to put the extraction fans are put on timers so that when they power on, they stay on for around 7 minutes after being switched off from the wall switch.