Socket, that is, the processor determines the type of processor socket, which can be installed on the motherboard. Most often, the processor change per unit of the new generation is also associated with a change of motherboard, although, of course, it should not always be associated with such an expensive step. 
Larga 1155
It's the old stand is intended for the second processor pok. (Sandy Bridge) and third-generation processors (Ivy Bridge). It replaced the exhaust socket LGA1156, which is not compatible. The ratio of senior, A new stand has one less pin. Also changed motherboard chipset, which have been marked as P67 and H67, and only the second version allows the use of integrated graphics.
see also:
The differences between the two main systems are as follows:
Besides, chips H67 and P67 is:
- increase bandwidth DMI bus bandwidth 2.5 GB / sec
- PCI Express support 2.0.
- standard SATA support 6 Gbit / sec for two drives
Larga 1150
This is the last stand is focused on the future owners of the fourth generation of processors Intel Haswell. The two main motherboard chipsets are Z87i H87. As is the case with the previous generation LGA1150 socket is not compatible with older socketami. The difference in structure is, first of all, fewer contacts (on 5 less). In comparison to the previous chipset, Z87 introduces several changes, eg:
- support 4 USB ports 3.0
- standard SATA support 6 Gb/s
At the beginning 2015 year appeared on the market the following chipsets: H97 and Z97, which should provide support for the future of the fifth-generation processors (Intel Broadwell), and also support SATA Express and Thunderbolt.
What's better 1155 or 1150?
The answer to this question is not unique. Yes, really, It depends on the processor. LGA1150 – это не новая и не будущая подставка, However, for many applications it is sufficient especially when positioned less money. Before deciding to choose first processor, and only then look for a suitable motherboard.