For a big diesel, you have to get a bit picky about batteries, but for a small gas engine, I'd simply look for the best value in a battery that will properly physically fit the car. Value = CCA + warranty (5 year min.) + $. It just really doesn't make that much difference what brand of battery you buy.

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'76 240D-Sold
'78 240D-Sold
'85 300 SD, 165K-Sold
'88 300 TE, 165K-Sold
'64 Porsche 356C Cabriolet- under restoration
'86 560SL 124K Miles-Sold
'94 320E Wagon, 74K Miles-128K Miles JUNKED
'06 E350 Wagon, 84K Miles
07 SL550, 14K Miles