以汽车为例，云平台的各个组件就好像汽车的各个零部件。OpenStack的特点是，定义好了各个零件的接口，比如轮胎，你可以有各种各样的轮胎可以使用，如果你向要一部车子，你需要自己选择各个零部件，然后自己组装，自己做各个零件之间的磨合，自己做性能的优化等，总之，OpenStack提供了各种各样的零件，你可以任意组合搭配，一切都取决于你自己的技术水平。所以使用OpenStack意味着你必须有一个强大的技术团队做支撑。记得Ustack的发布会上，程辉曾经分享过一个数据，大概意思是你要玩转OpenStack，至少需要千万级的投入，团队人数最少20人，这还不能保证你能玩的好。由此可见，OpenStack的技术门槛其实挺高的。这也是Ustack等OpenStack的相关公司的价值所在。
CloudStack就好像是一部已经组装调试好的车，你可以直接开走，也可以自己动手换个喜欢的轮胎，或者在汽车外面弄个喜欢的喷绘。总之，最复杂的工作社区已经帮你做好了，你只需要学会使用就行。而且CloudStack的学习成本低，开发成本低。Java的程序员在国内太多了。
这是shapeblue的观点。那么我为什么看好CloudStack呢？
我认为CloudStack最大优势在于apache基金会的管理，这是保证CloudStack能持续有生命力的关键。Apache基金会的管理中，很重要的一点是社区高于代码。Apache基金会关注社区的建设，项目本身的代码质量会因为社区的繁荣得到改善，社区也是项目有生命力的关键。
现在我们来看看OpenStack的玩家，HP,IBM,RedHat,Novell,Oracle,huawei,VMWare等，无一不是有极强的研发能力，没有一个不是庞然大物。国内的OpenStack的小玩家未来基本会逐渐被边缘化。OpenStack现在基本是大公司博弈的场所，小公司是无法驾驭这样一个负责的系统的。OpenStack是巨头们包装自己商业产品的嫁衣。
国内的中小企业如果选择了OpenStack，就会陷入一个怪圈，好不容易把各个模块调试稳定了，社区的版本升级了。这个时候是升，还是不升。升，所有的调试工作又得重新来过，不升，就会逐渐远离社区的版本，变成一个自己维护的孤儿版本，其代价是极其高昂的。
从运营成本来看，CloudStack是远远低于OpenStack的。从落地的商业案例看，CloudStack有大量的成熟案例。从长远来看，CloudStack会像Apache基金会下面的其他项目（例如Hadoop，Storm，Tomcat等），持续的发展下去。
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