My Mother has a 3 sink basin and loves it. I have a single sink and love it. I could probably handle a 2 sink, but I dislike the 3 sink very much. I think people sometimes have definite preferences based on how they like to work in the kitchen. Maybe ask how solid her preference is for the 3 sink or if she is even willing to accept the change. Who is doing most of the prep and clean up?

Fleur-Why do you dislike the 3 basin sink? is it because it takes away counter space or is it just an odd configurtaion for your liking?

Anyone recommend a 3 basin over a 2 basin?

I have a triple and love it. I have plenty of space on the counter and so the size isnpt an issue. Went with the undermount Elkay ELUH4020 which is an undermount when we renovated and replaced an abovemount triple
The main compartment is 14x18 and I find this big enough for my biggest sheet pans, it fits my refrigerator drawers etc. I have a huge laundry sink that I can use if I ever had need to soak something bigger but in all these years I've never had the need.
I don't have a prep sink and I like being able to have a center section of sink that is always open for pouring out a bowl of soup or rinsing a basket of fruit.
I'm always handwashing something and want the other sink section for draining items and holding the rack.
The triple just works for me.... with the undermount and the positive reveal that is required for the 4020, I can slide along a cutting board and use it much like the Stages sink... but I'm not moving dishes out of the way to grind up leftovers or rinse out the cat food bowl.

I prefer the single bowl sink simply because it is roomier. I wash most dishes in the dishwasher. When I wash dishes by hand, I do not fill up the sink with water, but just use the sponge to wash and then rinse each object.
With divided sinks, it just seems like the divider is not useful and in the way. Especially with the 3 basin sinks, one of the basins is so small that nothing fits.

On the other hand, I know that my mother likes to use the smaller middle basin for the garbage disposal, the basin on the left to fill with soapy water, and uses the basin to the right to hold the drying rack. She chose the 3 basin sink with her remodel years ago and still likes it.

I have a Franke single bowl (sits in a 36" cabinet) with a lip inside. It keeps a shelf rack on one side and that works for me as a kind of divider that is useful for the way I prep and clean up.

I think it is just what you like, and how you work at the sink, that dictates which sink works best for you.

There is another thread about a single sink, which I saw earlier today. Sorry, I don't recall the name at this moment, but there is probably some discussion on sink preferences.

Here is a link to the post I was referring to....

Here is a link that might be useful: Double bowl sink post