Boye Needlemaster Knitting Needle set vs. Denise Interchangeable Knitting Needle set

I have had the Boye needles for some time now, but recently bought the Denise set. Here are the differences that I have found. There are good points to each set.

Boye Needlemaster
Metal needles -Smoother so yarn slides better

Sharper points -Just my preference, I like the sharp points

Screw-on needles - have come undone during knitting and I damaged one needle due to over tightening

Denise Interchangeable
Cords much more flexible-more comfortable

Joins are much smoother - yarn slides much more smoothly over joins

More expensive - About $20 more per set

Twist-lock on needles to cords -may be more secure; no problems yet