It does make a large difference which lamps you get. Most sealed beams are junk very sloppily made on very old/decrepit tooling. The only sealed beams worth buying are the GE Night Hawk items. H6024NH for cars with one large round per side, H6054NH for cars with one large rectangular per side. 9004NH or 9007NH for replaceable-bulb headlamps (if your lamps take 9005 or 9006, there's a better option). Night Hawks can be tough to find locally, but Amazon.com has them on permanent sale, just type the part number in the search box.
Don't buy Sylvania Silverstar/ultra, Wagner TruView, Philips CrystalVision, or anything else with blue glass in the bulb and claims of "whiter" light — that's a scam.
If you want to put effort and/or money into seeing much better at night, go see my website and read up on improving the headlamp circuit, picking upgrade headlamps, etc.
Also see over here for upgrades to the car's other lights.
(Oh hi, I'm the automotive lighting boffin/maven
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