By my calculations using Sheldon Brown's gear calculator and using 700X23cc wheels and 170mm cranks as assumptions, your smallest gear on the proposed triple configuration will be 2.0 gear inches compared to 2.1 on the proposed compact configuration. You smallest gear with your current set up is 2.5 gear inches. So, from that standpoint, either set up will be provide a lower gear or gears than what you have now.
In my own experience in going from a triple to a compact (and then back to a triple), this is what I have to same in terms of differences" With the compact, I often found myself searching for that "sweet spot," i.e., that perfect gear, on the flats and/or in windier conditions, where microadjustments to gearing often seems more noticeable. With a compact, there are bigger jumps between some gears, especially if you use a wider cassette. I also missed a few of my bigger gears in downhill or tailwind conditions. I did run out of gears on occassion. I will say that shifting with a double, be it a compact or standard is often easier and smoother, and you will find yourself shifting more between chainrings that you might with your triple.
If you have the specifics for your cassettes, you might run them through a gear calculator and compare the specifis.
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