You can't really quantify 'too long' because without knowing what fitting they're going in, they might be perfectly fine.
And as for the ones from GE being 'better', the GE only has a 35D beam angle, where as the Philips has a 40D, and the GE is rated at 25,000hrs yet the Philips is rated at 40,000hrs, which is a pretty significant difference.
The Philips lamp also outputs 430lm where as the GE is only 320lm
I can't really class it as better, the other specs are similar, wattage, colour temperature etc
For a couple of quid, the Philips wins it hands down for me, and there's plenty of LED GU10's in the Philips range that are dimmable, this is just the first one I came across, many of them fit the standard envelope of a traditional GU10 halogen