Start with verified fit, structural suitability and practical access. These should take priority over decorative accessories, a particular colour or an especially tall top perch. Decide what your current furniture fails to provide, then spend on that gap. For example, a larger resting area may matter more than another enclosed cave if your cat rarely hides.
Compare the complete purchase cost, including delivery or required fittings, and check whether spare parts can extend the useful life of the tree. Avoid treating an advertised discount as proof of value; compare the product’s actual features and current alternatives. If your budget cannot cover a suitable tall tower, a simpler lower design may be a more sensible choice. The aim is to buy furniture your cat can use comfortably and that you can maintain properly.
Write a minimum requirement before comparing prices: for example, a suitable open bed, an accessible scratcher and an installation you can complete. Eliminate models that miss an essential item before deciding whether optional features justify more spending.
For product comparisons alongside this advice, see Ultimate PawHouse and Taj-MeowHall. The details below explain their sizes and uses.
Further reading: rspca.org.uk.
Ultimate PawHouse
Taj-MeowHall
Cat-Cave