If you don't have any special purposes for your box (besides using unsigned software) both chips are fine. The SmartXX chip has 4MB of space for different bioses, but the Spiderchip does not require soldering.
If I had to choose between these two chips, I'd go for the SmartXX chip because I don't like solderless solutions. Although it sounds nice, moving your Xbox might cause a loose leg (=wire) and you really don't want that.
For regular users, the SmartXX chips are somewhat overkill. They'll do fine, but it's like putting a Ferrari engine in a mawn lower. Personally I find most cheapmods (like the Aladdin chips) quite alright; they provide the basic functionality most users require and come for a fair price.
To burn XBOX games, you first need to create XBOX images. Software like Craxtion or Qwix (both free) can do this. After the image has been created, DVDDecrypter can be used to write the created image file to disk.
If there are any questions left, feel free to answer. And before I forget: be welcome!