The best replacement for straight line is accelerated depreciation.

The best alternatives to straight line are rated as following:
★★★★★  accelerated depreciation
★★★★  macrs
★★★★  declining balance
★★  effective interest method
★★  double declining
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★  double declining methods
★  declining balance method
★  double declining depreciation
★  reducing balance method
★  diminishing value
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  circle
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  flatline
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  accelerated method
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Speaking about straight line, one probably shouldn't forget about negative slope.

Other search terms related to straight line and their ratings are:
★★★★★ negative slope
★ half year convention
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straight line
accelerated depreciation
macrs