I own a bunch of trimmers, and I still use all of them. Usage depends entirely on volume I expect to do.
The Giraud is a great unit as I can pretty quickly change between calibers and it chamfers and deburrs in one cut. I use this for bolt gun brass mostly.
The WFT2 was a great place to start from and was my first electric trimmer, but doesnt chamfer or deburr. I still use it for 300 BO.
The Dillon RT1500 handles the bulk of my AR brass for 223 and 308. It is fast and accurate. No chamfer/deburr, but my SSTL media tumbler solves that issue.
The Lyman hand trimmer does the odd calibers that I dont have setups for. Its accurate enough for those calibers for me.
Suggestions:
If you are only going to trim 308, I would suggest the Giraud Tri-Way. The only downside is you cant just switch it from caliber to caliber easily and calibers are somewhat limited.
If you want to cover alot of calibers and not spend a fortune, the WFT2 is a great option as well.
If you are only trimming 50-100 at a sitting, the Lyman with the power attachment is a solid option and will do anything and everything including pistol brass if you ever have the need.
One thing that wasnt touched on here? Having a good VLD style deburring tool is a must have, even if your trimmer does chamfer/deburr. I use the Lyman one, but there are a bunch of them available.