It would have been helpful to know what you are planning to do after you use the attention getter.
One obvious angle would be to point out that Huck was the one who ran away. Tom had the more vivid imagination (as illustrated by his plans for Tom Sawyer's Gang and his elaborate scheme for breaking Jim out of his prison on the Phelps farm), but Huck actually carried out his plan and left St. Petersburg on his own.
I did wish Tom Sawyer was there, I knowed he would take an interest in this kind of business, and throw in the fancy touches. Nobody could spread himself like Tom Sawyer in such a thing as that.
Another approach could feature the contrast in family background of the two boys. Tom had a loving and supportive aunt and uncle and cousins; Huck had an abusive drunk for a father who was present only when he wanted money from Huck's share of the funds controlled by Judge Thatcher.