They are actually 2 different TYPES of discharges so your question is hard to answer.
1 is a device that discharges slowly with a pulse built in.
2 is a tray that discharges each cell at a HIGH RATE.
The Spintec or the Trinity Dyna Pulse is a great idea but it's best if you STILL get a tray.
Since I race 4 and 6 cell I went with the trinity dyna and then have a rayspeed tray.
You cant really loose with either of the choices you have asked about but eventually with the Spintec you would want a tray as well to back it up.
I would NOT spend the money on a Integy 30 if I bought a Spintec.I would buy a tray that discharges at alot lower amp rate.
Tekin Tray,Novak Tray,Integy zero tray,trinity tray,and/or others.
I use the Rayspeed tray due to quality,fan and being able to switch the cutoff.
Goodluck with your choice.
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