I've been hopping between rare and normal trading for the past couple months...through so called rare nerfs and trading nukes.
I have a solid run, that occasionally gets some attention but stays fairly stable due to demand and supply in the 100s of thousands up to millions. As long as I diversify my hold, I am able to maintain consistent pricing. It nets me, on average, 1250 cr/ton. It is one jump and each station is less than 400Ls from drop in. It makes decent money, and is a great way to reclaim lost credits due to an insurance claim.
Now, I also perform a rare trade run over 76 stations using a travelling salesman algorithm (
https://forums.frontier.co.uk/showthread.php?t=103682) that ensures I am taking the most efficient path and selling off rares at an appropriate distance.
I finally got an Asp and I took it out comparing how I feel about each money making venture. Bumped down the shields to make room for 120 tons of cargo and started out on the traditional run. Spent most of my Friday grinding out this trade run (with occasional forays into the nav beacon that got me to Expert combat rating, woo) and made some decent profits @ 300k profit per round trip...each round taking about 15 minutes (time included for nose picking, staring at the star and goofing in the station).
Yesterday, I got on my rare route. I didn't bother waiting at each station to get my full allotment unless it was stupid low like 2 tons available. Did some occasional bounty hunting at Nav Beacons along the way (seems like rares attract pirates like a black hole attracts would-be explorers). How does six cannon balls to the face feel mister cobra, bahahaha.
Anyway, with an Asp hauling 120 cargo (which I do get filled at several points along the rare route) I was making about 2/3 more money as my regular route. Granted, it has some drawbacks. The first one is route planning, I actually dropped four tons of cargo in favor of a docking computer about half way through the route. This gave me time to let the gal map sit and plot the next route while the docking computer handled landing. However, as I started picking up some narcotics, liquors and tobacco rares, I found that I was using the computer less and less as station prohibitions had me silent running into the slot at almost every non-anarchy location. Really, officer, these Holva Dueling Blades are completely cosmetic and are in no way personal weapons at all...really.
I also play in Open, so the sight of other Commanders near hotspots is unnerving when you are carrying 90 tons of the rarest stuff in the galaxy. Though, either the pirates couldn't wise up to my evasive maneuvers in super cruise or there were too many targets and I got lucky (also, seeing that my Asp isn't kitted out as a hapless trader but rather more like a smuggler with nasty, disease spreading teeth might keep some trouble away).
Conclusion...In my personal opinion, rare trading is more exciting, profitable and varied. Regular trading, is safer, relaxing and profitable, though less so than rares. If I only ever played in Solo, then I would probably do rare trading only. However, since I'm mostly an Open player, I'll swap between the two incomes based on how much risk I'm willing to take on for the day.