I am considering putting in either a Carrier 58STA or 58CTA system. Can you tell if you think the CTA is worth the extra $$. Is the 58STA reliable or is it the lowest end Carrier offers?

Its being installed in a small attach and I was told both could fit but the STA was more compact. Its the CTA a more efficient and reliable system?

Would appreciate any and all information.
Thanks so much