They are equally easy. In fact, if you are using Zend_Db_Select objects to build your queries (You are, aren't you?), they are exactly the same.
It is worthwhile to mention that Zend_Db_Table queries return either Zend_Db_Row or Zend_Db_Rowset objects, which allow you to some very nice things such as:
PHP Code:
<?php
$bugs = new Bugs();
$row = $bugs->fetchRow($bugs->select()->where('bug_id = ?', 1));
// Change the value of one or more columns
$row->bug_status = 'FIXED';
// UPDATE the row in the database with new values
$row->save();
I could go on and on, but I'd just be re-writing the documentation.