If you must replace windows, get the same material and style as originals.

IMO, between the glass grills look fake and cheap, true divided lite look best but are so expensive, and removable is a good option.

What is there now? True divided lite? Then get the same to keep the character of the house. Between the glass look fake and removable ones often don't stay in. Our contractor had us get new construction windows not replacement windows when we were replacing ours. He says you get a better product