I have three safety razors. Any quality safety razor will work fine, but I own Merkurs and a Muhle. The Muhle is for when you really want the closest shave possible. It is the most aggressive safety razor I know of and downright dangerous. The thrill is the challenge to not cut my throat.
I have a very tough beard and before I went to the safety razor I could only get about 3 shaves from a cartridge type razor. Cartridge blades were costing me around $40 a month not including soap etc. Now I use Feather double edge blades for only three shaves, but at a cost of less than $3 a month plus soap. I save over $350 a year on blades and get a shave as clean as a baby's ass!
One other benefit. When you shave so close with a safety razor you are actually removing some of the old skin and wrinkles over time. You will look younger. LOL!
Oops! That’s less than $30 a month plus soap.