The Ruger SP101, as the OP (original poster) said, is what he has, and I wouldn't sell it off to get something else, at this point. OP, it's working for you right now and something else may later be found to not be to your liking.
https://ruger.com/products/sp101/overview.html
One's finances are always going to be a factor for consideration. If the OP can afford two revolvers for awhile, I say do so, until he definitely say he likes one over the other. Otherwise, he may regret letting the SP101 go, just to get something else he doesn't quite like in the long run.
While I've had an SP101, and wished I still owned it, on retrospect, I also didn't like the overall feel as much as my: S&W Mod. 66-2; 642-1; 640-1; & 60-7, among other S&W revolvers I also have.
The Model 649 (in its final .357 Mag chambering) was discontinued, not to say a used one wouldn't become available at any time. S&W does still have the Mod. 638 in a similar design, but lighter weight in an aluminum alloy frame.
https://www.smith-wesson.com/product/model-638
The S&W Bodyguard 38
https://www.smith-wesson.com/product/bodyguard-38
gets mixed to negative reviews/comments. I've not ever even touched one and can't personally comment.
Ruger LCR
https://ruger.com/products/lcr/overview.html
I considered getting one but just never got around to spending the hard-to-find money to do so. I've read mostly good reviews, but some negative reviews, too.
The current S&W Model 36 is +P rated, as somebody else said.
https://www.smith-wesson.com/product/model-36
I wouldn't know how much, +P ammo, an older non-+P Model 36 could take before some type of failure. For some monetary estimates/comparisons, however, 5,000 rounds of .38 Special would likely be ~$3000, just for practice, with +P defensive ammo being approximately $1/round, or ~$50/box of 50. Would a used non +P Mod. 36 take 50 rounds of +P ammo? Probably, but I don't know regarding any specific old Mod. 36.
Enough from me as I'm not anybody's salesperson. OP, good luck in your search and I hope you decide upon something to augment your revolver inventory and can then find one for sale at an agreeable price.