This is a question for a psychiatrist, not an internet message board.
I don't know man; not necessarily, but I agree with your point that it's
best-handled by a Pyschiatrist. To OP, you're correct that it's a pretty broad question to ask, especially considering that different drugs effect people in different ways. At least, as a starting point, you can make a general assumption that many of the newer SSRI's have been shown clinically to produce less of the side-effects commonly associated with SSRI therapy. These side effects commonly include erectile dysfunction, inorgasmia, somnolence etc. The thing is, that the side-effects of SSRI's are generally pretty mild for most folks.
I've personally been on a few different SSRI's. I found while they made me less "depressed", they also seemed to rob me of much of my creative though process, which is required heavily for my work in the classroom. However, for some people who are in dire straits, side-effects can be tolerable in exchange for a slight reprieve from depression. I can say that Fluoxetine (Prozac) produced significantly more erectile dysfunction than Citalopram (Selexa)/Escitalopram (Lexapro) and this side effect is the most severe of any that I ever experienced.
So, I think that it can be worth it to pursue some of the newer SSRI's in favor of the older ones, based upon my own experience, but I don't know if it's totally prudent to say, spend a lot more money on Escitalopram when Citalopram can be had for cheaper with a negligible difference in side effects. I've had prescribers intimate to me that they believe Escitalopram was nothing more than a pharmaceutical evergreening of Citalopram to enable continued profits from the more antiquated drug.
But yes, this is definitely something that will start and end with a prescriber, most likely a PsyD. We're happy to give you advice in the meantime, but we definitely can't solve the problem, but it sounds like you understand this.
