Stats Question

Ok, I know this is a silly question, but--opinions wanted.  Ever since I've started running I've used my Runkeeper app for every run (except for the Color Me Rad 5k and Castaway Cay 5k).  I know that it's been found to be a little off but it's what I've based all of my personal stats on.

For a way early birthday present, my parents got me a Garmin Forerunner 10.  I used it on my run today.  (Yay for finally getting the watch/shoe shot!)

I also used my Runkeeper app.  And the stats were a little off

Stats:        Runkeeper     Garmin
Mile 1        10:01 pace     9:58 pace
Mile 2        10:07 pace    10:02 pace
Mile 3        9:51 pace      9:58 pace
Total          3.01 miles     3.00 miles
Avg. pace  10:00            10:00
Time          30:02            29:58
 

So not too much difference, except for the pace for each mile.  Runkeeper started off at a slower pace by 3 seconds, then by 5 seconds but then suddenly was faster by 7 seconds (so jumped up 12 seconds). 

And yes, again, I know this is super silly, but I keep track of my stats.  Do I continue to use the Runkeeper ones since that's what all my old ones are based off of?  Or do I start using the Garmin stats?