The best replacement for lu is qr.

The best alternatives to lu are rated as following:
★★★★★  qr
★★★★★  simon
★★★★  bathroom
★★  schwank
★  daza
★  shc
★  karlovic

Your alternative for lu is not listed? Suggest!
Speaking about lu, one probably shouldn't forget about partial pivoting.

Other search terms related to lu and their ratings are:
★★★★★ partial pivoting
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Google Trends

Scale is based on the average worldwide traffic of lu in all years. Click on graph for more.
lu
qr
simon