Let me start by saying that you cant go wrong with either conical. I own one of each. Initially I bought the SS Brewtech about two years ago and was pretty happy with it. It was a big upgrade from my carboys.
A few of the things I didn't like about the SS Brewtech was the 1.5" sanitary 90 degree elbow into the 3/4" ball valve would consistently get clogged with any IPA I would brew. I would have to push a sight glass cleaning bush through it to get it to dump. What a mess it would make. The other big issue for me was the pressure transfer would not work very well. You can only put a couple PSI to it per the recommendation. It gravity transferred much better. When I would transfer to a keg it would typically take about 20 minutes to fill a keg. The other drawback was that it didn't have a sampling valve.
My recent addition was the Spike Brewing conical. I decided to try their conical after buying 3 new brew pots from them. Man! What a difference. Everything about it is top notch. I have used it 3 times now and each time I use it I love it more. To start it has a 4" cap on the lid to make adding stuff in the top a breeze. I even oxygenate through it. It also is super thick so you can put up to 15 PSI in it. The large 2" dump valve makes dumping trub and hops a breeze. It has never clogged on me and I put a pound of hops in it on my last IPA. The sampling valve makes it very easy to pull a sample for testing as well. Everything is connected with sanitary fitting, even the thermowell. To top it all off, Spike has the absolute best customer service and support I have ever experienced. The have always responded within a few hours.
In conclusion, I would HIGHLY recommend going with the Spike Brewing conical for all the reasons I listed above. I included a couple pics as well.
Let me know if you have any questions.
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