I have all thumb triggers, and really prefer the PC front trigger like you've had. Drop safety. 97% of the time I hold a grinder in such a way that the dead man switch would be covered.
I'm liking my dewalt 5" units a lot, not that I've done a ton since I got them.
Next order I'm planning on a battery impact for the buggy. 15+ minute tire changes that kill me are useless, especially without a codriver.