[VoiceOps] What is your favorite line of IP Phones and Why?

What is your favorite line of IP phones and why? What PBX or softswitch do you use these line of phones with? I would love to hear responses for both Hosted PBX applications, and On-Prem PBX applications. Is there any reason or need to use non IP phones in todays environment? I know NEC, Avya, and others make multiple digital non SIP phone systems.