Compare the same measurements and features for both trees on a short written list. Record usable resting areas, entrance openings, assembled footprint, individual load limits where provided, and the installation requirements. Then note how your cat would travel from the floor to a comfortable perch and back down again. Count features that your cat will genuinely use rather than treating every extra platform as an improvement.
A roomy lower bed can be more valuable than an additional small basket. Include practical ownership details such as washable covers, spare posts and the effort required to clean enclosed sections. Finally, compare the complete cost and delivery arrangements. This approach helps you explain why one model fits your home better, even when photographs make both trees look similarly impressive.
Give each candidate three columns: confirmed, unsuitable and still unknown. Leave an unanswered capacity question in the unknown column instead of awarding points because the photograph looks substantial. This makes the final choice easier to explain.
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