Best practices for public folder preparation before migrations

Trying to get this script to run:

$pf=Get-PublicFolder \ -Recurse -ResultSize unlimited;foreach ($i in $pf) {$s=Get-PublicFolderItemStatistics $i.EntryID;foreach ($r in $s) {if ($r -gt "38600") {$r.MessageSize,$r.PublicFolderName}}}

But I get this error:

Cannot compare "Microsoft.Exchange.Data.Storage.Management.PublicFolderItemStatistics" to "38600" because the objects are not the same type or the object
"Microsoft.Exchange.Data.Storage.Management.PublicFolderItemStatistics" does not implement "IComparable".
At line:1 char:145
+ ... mStatistics $i.EntryID;foreach ($r in $s) {if ($r -gt "38600") {$r.Me ...
+                                                    ~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [], ExtendedTypeSystemException
    + FullyQualifiedErrorId : PSObjectCompareTo

Cannot compare "Microsoft.Exchange.Data.Storage.Management.PublicFolderItemStatistics" to "38600" because the objects are not the same type or the object
"Microsoft.Exchange.Data.Storage.Management.PublicFolderItemStatistics" does not implement "IComparable".

Any ideas as I can't figure out the error, unless I need to run some other variant?