Boot loader location

After installing 11.1 (dual boot with Vista) OK, I lost (as many other people as I see) the boot loader; I try to repair, didn’t succeed, then reinstalled (automatic configuration) OpenSUSE and both O.S came back OK.

Now I see that the bootloader location is set to the extended partition, but the suggestion of YAST is boot partition or root partition and in some posts people say it’s better to use MBR.

The questions are:
Why do I have this non recommended option?(I used automatic configuration)
Which is the best option for the bootloader location?
Is it worth changing it?

Thanks in advance.

What is best is different for different people. If what you have now works for you, just leave it.