When both products generate a photorealistic redesign from a photo in about the same time for about the same money, the feature lists stop being useful. What separates them is narrower and more important: what the tool was built to understand.
A broad interior and exterior tool has to be good at kitchens, bathrooms, living rooms, facades and yards. That breadth is a genuine advantage if you are redoing a whole house, because one subscription covers the lot and you are not learning two products.
It is a disadvantage in a garden, because a garden is not a room. The things that make an outdoor render convincing are specific: plants that read as the right species and the right maturity, paving that sits into the ground instead of floating on it, planting beds with a sensible edge, and light that behaves like outdoor light at a plausible hour. A general-purpose model averages across everything it has seen and produces gardens that look like garden-shaped decoration.
The other practical split is the vocabulary. Naming a style is not the same as designing one. Options built around outdoor space, whether the tool offers you a pergola, a fire pit, a raised vegetable bed, a specific planting palette, decide how far you get without fighting a text box.
Straight answer: if you are redesigning the inside of the house too, one broad subscription is the sensible buy. If the project is the yard, pick the tool that only has to be good at yards.