if unsure what size needle to use with which weight thread visit the Superior Threads web site- they have free charts that tell you which size needle to use with which thread. the type of needle is not as important as the size being correct for the thread being used. I most of the time use 'sharps' or universal needles- but always the size for the thread being used. a 90 is a pretty large needle- are you using heavy thread? most of the time I quilt with 50-60 wt thread and use a 80/12 needle...but if you are quilting with 30 or 40 wt thread the 90 is probably right.