整新品MacBook Pro 配備 Retina 顯示器選擇

剛好朋友去美國一段時間，想順便幫我帶一台回來。
在美國蘋果商店看到整新品的價錢很心動，想請教各位大大的意見。

Refurbished 13.3-inch MacBook Pro 2.5GHz Dual-core Intel Core i5 with Retina Display

Originally released October 2012
13.3-inch (diagonal) Retina display; 2560-by-1600 resolution at 227 pixels per inch
8GB of 1600MHz DDR3L SDRAM
128GB Flash Storage
720p FaceTime HD Camera
Intel HD Graphics 4000

美金1059 台幣31910

http://store.apple.com/us/product/FD212LL/A/refurbished-133-inch-macBook-Pro-25ghz-Dual-core-Intel-Core-i5-with-retina-Display

Refurbished 13.3-inch MacBook Pro 2.4GHz Dual-core Intel i5 with Retina Display

Originally released October 2013
13.3-inch (diagonal) Retina display; 2560-by-1600 resolution at 227 pixels per inch
4GB of 1600MHz DDR3L SDRAM
128GB Flash Storage1
720p FaceTime HD camera
Intel Iris Graphics

美金1099 台幣33115

http://store.apple.com/us/product/FE864LL/A/refurbished-133-inch-macbook-pro-24ghz-dual-core-intel-i5-with-retina-display

兩款主要是發表年份差比較多，會不會因為年份比較之前比較容易有問題？
那兩款效能比起來哪款較好？
我知道後面那款的記憶體無法升級，硬碟是可以升級。那第一款也是嗎？
還有在台灣也有保固嗎？