The space between the bath and the shower is far too narrow in your new layout. If you want the bath in that location, then rotate the shower 90deg. It would increase that gap, and you would still have enough space for total rails and storage.
Definitely two towel rails, one within reach of the shower, and one within reach of the bath.
I prefer heated towel poles to towel rads. Much easier to hang the towels, and just as effective for drying. Not as effective at heating the room, so ours are supplementary, not instead of an ordinary radiator.
For a towel rad, we have one in the family bathroom that is a half-cylinder shape, similar to the screenshots. Takes up less wall-space than an equivalent flat profile rad, but holds more towels. Like with the towel poles, it is easier to hang the towels on it than on a conventional towel rad.
Will you have a radiator in the bathroom as well as the towel rads? Our towel rad is somehow connected to the GCH in such a way that it comes on when the heating is on, but also when the hot water is on. That way it works even in the summer when the heating is not on, and we do not need a radiator in the family bathroom.