Depends on the layout of the bow of your boat, and if you intend to fish other ways besides "just" Spider Rigging ... IMHO
I think the general population uses 14' rods as the "all around good length".
Be careful when getting "trolling rods" to Spider Rig with ... as they may have stiffer tips & not be limber enough to show lite bites. Take for instance my 14' rods ... one BnM PST and two BnM Capps/Coleman rods: 1/2oz weight = about the same tip bend -- 1.5oz weight and the more limber tipped Capps/Coleman rods will bend down farther. That's what I mean by the "trolling rods" comment, since PST means Pro Staff Trolling ... and are meant for trolling with heavy weights. The Capps/Coleman rods, on the other hand, are signature rods from tourney pros that primarily use the Spider Rigging technique.
By "better types" of trolling rods I will have to assume you're actually asking about "brands" ... and you're right, there are many to choose from. And on that, I will only say that you will get many different answers as to which one is "better/best". Jenko, ACC Crappie Stix, BnM, Ozark, and Southern Crappie rods are the name brands most often discussed. I've only used BnM long poles, so I have no way to compare & therefore recommend another brand. And I don't actually "Spider Rig" ... I "push" jigs & cranks or cast jigs, depending on the lake and/or time of year.