At present,some people think ….while others claim …Both side

At present,some people think ….while others claim …Both sides have their merits.实例
在……处补上句子,不知动词形式,

At present,some people think it's beneficial to do part time jobs in spare time,while others claim that without knowledge and experience,it's a waste of time to do such part time jobs as waitors.Both sides have their merits.
再问： 请问waitors是什么意思呀？
再答： 不好意思，打错了一个字母，服务生 waiter