Since this is the realm of coding style, it's almost certainly all personal preference. ;>
I know that I tend to prefer using a hash once I get above three or four parameters. Some of the reasons that I can think of why I tend to do so:
*shrug* All of the above are just personal preferences, yes. Do what seems to work best for you.
perl -pe '"I lo*`+$^X$\"$]!$/"=~m%(.*)%s;$_=$1;y^`+*^e v^#$&V"+@( NO CARRIER'
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