I used the 10day pic course.I would recomend it precisely because it is total immersion training.I can gurantee it will be the most challenging rating you will earn.The problem with using the local cfii is that if they are also time building for another flying job,they frequently get hired and move on leaving you with having to find another instructor.The instrument rating ,I found,developed and used skills that are very perishable.Even 1 week between lessons and you will lose your scan.Getting it done in just 10days is a real drag..especially if you have to work ...better if you can take 10 days off,...you will have to put your instructor up in a hotel room,..more cost...and dont even think of putting him up at your house cause you will develop a real love/hate relationship...so all and all the local cfi prob more relaxing but I would bet you dont have your ticket ao your time table...good luck and remember the instrument is just a license to learn...kpc