Second era is less epic fantasy, but is a much better written series (better written characters etc). Depends what your looking for really.
I believe the third era is due this decade, will be interesting to see how that differs from the first two eras. (Other than probably having a lot more Cosmere connections)
The main thing to look for with motherboards (other than CPU compatibility) is the ports it has. Number/type of usb ports, ethernet speed etc. that's most likely to be the thing that annoys you if you buy the wrong one.
(PCIE expansion cards can fix most problems there though if needed)