All down to personal choice I'd say as both are good disc manufacturers. I've only ever had 3g on the starlet (not the ones your looking at) and never had any problems.
I've only ever had 3G's on mine. Groove and dimpled ones are not really much of gain that just the grooves ones to be honest.
I had groove and dimpled on it last and changed those to just grooved 3G's. No problems with them as yet allthough some people have had them crack but, touch wood, mine are fine and brake very well.