GR products have taken the cake as for as weather applications over the past many, many years. I was part of their beta test team since way before it was available to the public. GR products are outstanding, very customizable and extremely stable.
Lately it has been WSV3 to be developed as an "answer" to Gibson Ridge's GREarth. I own both. One of my biggest favorites of WSV3 is having level 2 data at my finger tips without having an external data subscription.
I also own Radarscope Pro on my tablet. For the price, it can't be beat...and then another $10 and you have lightning for a year. So if you're on a tight budget, go for Radarscope, but definitely plan on getting GR3 as well. WSV3 is around $180 for a year or $399 to buy out right.