No, not really. Just watch whatever series/season you find interesting.
Disclaimer: I'm more familiar with the Power Rangers franchise than I am with the Super Sentai franchise.
Each show in the Super Sentai (SS) series was produced as standalone. Although there are a few crossover episodes where characters from previous shows have appeared in more current ones. This makes it appear that the shows happen in the same universe, though incidents like this are far in between and for the most part each show keeps to its own continuity.
The same goes for the Power Rangers (PR) series. To a great degree, PR shows implement the majority of the corresponding SS show elements. They will both have the same costumes, monsters, action sequences, and even the majority of the story line. However, the PR show will implement its own US only elements, such as different actors out of the suit, different names, and censoring some elements of violence or sexuality. Some PR shows have gone as far as creating action sequences and their own extra (sixth ranger) suits.
In theory, all PR shows exist in the same continuity. Characters often appear in more than one show as main characters, not just as cameos. For instance, original sixth ranger Tommy Oliver has appeared as a major character in four PR shows, and cameoed in more. However, this continuity is not without problems and serious snarls. For instance, in Super Mega Force the rangers have the ability to mimic the powers of past rangers. Among those they are able to mimic the SPD rangers, even though SPD is chronologically set far into the future of the PR timeline.
With all these continuity snarls, and the fact that both SS and PR use the same base material in different ways means that there's no real way to integrate SS and PR into one continuity.
So you don't really need to watch anything in order. Just watch whatever series (SS or PR) that you find interesting and don't worry to much about an unified story, since none exist.