I think it is a matter of preference, Windows Home premium is basically used for home users, whereas Windows Professional is used by both Home and Office use.
Please look at this info and what and what not is included in each version of Windows 7 Which Windows 7 is right for you? | Windows 7 Insider - CNET Reviews
Also bear in mind, that the Win 7 Home Premium version you are looking to buy is that of OEM
Windows OEM versions mean that once activated it will be tied to the system it's installed on and is not transfreable to another computer, so if something happens to that system and it no longer works, the license dies with the system.
OEM versions of Windows 7 are identical to Full License Retail versions except for the following:
- OEM versions do not offer any free Microsoft direct support from Microsoft support personnel
- OEM licenses are tied to the very first computer you install and activate it on
- OEM versions allow all hardware upgrades except for an upgrade to a different model motherboard
- OEM versions cannot be used to directly upgrade from an older Windows operating system
A retail version is indigenous to one computer also but is transferable to a new computer if the need arises.
Hope this helps