Slotted dics v oe drilled?

[shorts!]

It's time for some new discs as once again the drilled holes are starting to get small cracks running from them. This wouldn't happen with slotted I guess but is there a down side? Any suggestions or brands?
I'm happy enough with their stopping power but this always happens after (quite) a few miles.

[shorts!]

Thanks Clive, CL is also where I ended up via the guys at both Bespoke in Ware and Power. One more trackday on the old drilled discs then a change to these new slotted 330s from CL.