My new obsession with Twitter (follow me as @draab) has led to several messages from people who seemed to have trouble choosing between Eloqua and Marketo. This is a bit perplexing, since those products are at the opposite ends of the spectrum: Marketo being relatively low cost / limited functionality / easier to learn, and Eloqua being higher cost / richer functionality / takes more training. do recognize that they are the best known vendors in the space (with apologies to Vtrenz , whose identity is somewhat blurred since its purchase by Silverpop ). Just kidding.or