Diversity and Compatibility
Group projects are designed for students to learn how to work with a variety of different types of people and negotiate different types of situations.
While it's good to find teammates that have different skills and experiences, it's also very important to make sure that you are able to work with those people. Teammates with different time constraints can find it especially challenging to work together successfully.
For example, let's take part-time and full-time students working together on a team:
If you are a part-time student (especially if you work full time), it may be difficult to work with a group of full-time students. Your free time is mainly on the weekends and they may prefer to meet during the week. You may find that the only time you can find to meet is after your night class. That's after a full day of work and after your class.
Also, part-time students generally have to plan ahead and finish work early, since they're working around a full-time job, family obligations, and commuting. Full-time students often work on their projects closer to the actual deadline and can set aside time during weekdays for group meetings. Having to work on projects weeks in advance can be annoying for full-time students.
We're not saying that you shouldn't try to put together a diverse team. Just be aware that students have to use time differently.