I have both types, and my only quarrle with the switchers is rf hash.  If 
your house and shack are well grounded, this is not so much of a problem.
I have the alinco dm330v (I think).  This is a variable voltage 32 amp 
supply. Fan noise is nearly nonexistent.  Hash is only a problem in the am 
broadcast band, and there is a control to shift the switching frequency 
which helps with this.

However, If you do not ground the supply, you will get hash all over the 
place.
It is rather old, but qst did a review of several switching supplies I think 
in 2001 or early 2002.
I picked the alinco from that review.  It had the combination of features I 
needed at the time.
There is a new supply out there which uses ultracapacitors to cover current 
surges.  It is nearly pocket sized, but rated for 25 amp.  I have forgotten 
the manufacturer, but it is something research, I believe.
I am going to look into it sometime soon.
Hope this ramble helped.