The best replacement for oasys is advance.

The best alternatives to oasys are rated as following:
★★★★★  advance
★★★★  air optix
★★★★  acuvue advance
★★★  acuvue 2
★★★  biofinity
★★  kronos
★  proclear
★  purevision
★  o2 optix
★  moist
★  optix
★  advance astigmatism
★  avaira
★  acuvue moist
★  purevision 2
★  trueye
★  night and day
  ctm
  o2optix
  soflens toric
  neko
  advance plus
  yamaha motif
  biofinity toric
  advance acuvue
  air optix aqua

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Speaking about oasys, one probably shouldn't forget about hydraclear.

Other search terms related to oasys and their ratings are:
★★★★★ hydraclear
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Google Trends

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oasys
advance
air optix