I personally like IGO. Although Sygic is also a good one. Many people seem to prefer it over Igo. They each have their pros. Look in the appropriate forums for each and there are plenty of maps available for each.
I have been using both Sygic and Tomtom, both are great but for some reason Sygic map is alway almost twice as big as Tomtom map
Well I like Sygic for the fact that you can pick the countries you need.
TomTom does not give you that.
You have to take all Europe if you want all the countries or not.
They have Benelux, France or D.A.CH but they do not talk to each there
So you have to have all of Europe if you want to drive from Belgium to France and the over to Germany.
With Sygic you just download Belgium, France and Germany and off you go.
This saves on a lot of space on your phone and opens quicker.
But both user TomTom maps.
I have not looked at the size of TomTom vs Sygic maps for reasons I have stated above.
So I hope this helps you.
By the way I have not upgraded yet still using 13.4.2. It works and is stable.
But I do not have Android's KitKat on my Phones or Tablets.