look if you have the magazine it explains so much in detail that all the information you need is virtually there. You ask what is the difference between uniform and automatic, this is explained in the magazine, I dont remember exactly what is the algorithm Oracle uses to extend an automatic allocated local tablespace but I do rememebr the diffrence, automatic managed tablespace, extent size grows exponentially in multiples of 128K while as uniform all extents will have same size. If you want to know the algorithm read the article in the mag, it is there fully detailed.
We have a database with all locally managed tablespace except system because it is not allowed! Works fine, so far so good.