I do both, and can tell you first hand that the tiny amount of time you save in development is going to be a very small drop in the bucket compared to the overhead costs of licensing and setting up a cf supported server. Yes, cf has many built in functions but like said before, most php developers build libraries to take care of what they need and don't add the bs they don't want (unlike cf where everything is there, bogging down the server, regardless of whether you actually need it).
Apache's server is the most popular server in the world. Not because it is free. It's because it works and has almost no downtime. It's also designed with PHP in mind.
Also like previously mentioned, it's very tough to find cf support. Go look in the cf forum. The most previous post was made two days ago. The one before that was over a week ago. Now compare that to the PHP forum.
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