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You need to consider which type of double edge razor you want:
1) Twist-to-open - twist the bottom and the doors on the top open
2) Three Piece - comes appart into threee parts;
3) Adjustable

The HD is also a very popular razor.

I personally do not think that there is a "best razor" at all. Like the razors you will need to try a few and decide which is the best for you. Although I can give some guidance here, there are...