The best replacement for 303 is 304 stainless steel.

The best alternatives to 303 are rated as following:
★★★★★  304 stainless steel
★★★★  316 stainless
★★★  404
★★★  raggtopp
★★★  316 stainless steel
★★★  316
★★★  3006
★★  304
★★  302
★★  304 stainless
★★  armor all
★★  vinylex
★  301 redirect
★  416 stainless
★  301
★  304 sst
★  316 ss
★  307
  zipp 404
  starbrite
  x0xb0x
  404 firecrest
  304 ss
  sr44sw
  8mm mauser
  405
  lexol
  202
  8x57
  armorall
  enve 3.4
  scotchguard

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Speaking about 303, one probably shouldn't forget about kesha.

Other search terms related to 303 and their ratings are:
★★★★★ kesha
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303
304 stainless steel
316 stainless