As far as I can see, Top Gun doesn't have a top trader commentating on the top picks of the day or telling you the trades he's made, which makes for excellent mentoring. With Via Trader there are 3 areas if added value, if you like:
1) Alan's commentary
2) A list of hot stocks for the day, which is more than enough for you to get $1 a day off if you don't mess it up. (I did yesterday, but that was my fault- you could have got your money for the day on AAPL alone, which was called several times, and SNDK - same thing + some NYSE stocks if you trade those.
3) Alerts of set ups forming in those hot stocks as you go through the day. As has been mentioned, you need to take these in context of what's going on in the broader picture. Eg. you may get an alert during the lunchtime period, because the price action happens to form one of the patterns, but the market is stagnant.
As has also been mentioned, you need to understand the Via Trader set ups- which means training. FWIW I did the training first, because I'd reached a point where I needed someone's help (or many months of trying to work it out myself). The scanner came afterwards as a natural progression.
As Pitbull has said, having the commentary is like having a little voice inside your head. I find it takes the isolation out of all of this, but you are ultimately left to make your own decisions as to how you trade and what you trade. You have to take responsibility for the decisions you take- when you enter, when you exit. You cannot use a scanner as something to blame when things go wrong. If you want something that will help you get your $/day then Via Trader does the job, but you have to do the job on yourself- do the hard work to learn the set ups and get through your psychological barriers. If Top Gun does or even claims to do all that Via Trader does, then have a look.... Well have a look anyway.
If I were you, I would look at both. They've both got free trial periods so you've got nothing to lose.
Apologies if the above reads a bit harsh, but that is the way it is (in my view!)