The start of two legendary toku series both give you a classic special effects episodic story telling and great monster designs.

Be are old toku with similar special effects both are light heart series where the enemies cause a lot of mischief the main characters both have kid companions

Both have a similar approach to realism in terms of monster attacks. Also Goyellow reminds me of ultraman Leo's human form in terms of personality with both being hot heads that go though a lot of training

I feel like cosmos continues on the themes of Gaia, there is a sense of companionship between both ultras and their team and the Kaiju felt like a part of nature rather then just monsters

Neos is basically a lower budget straight to dvd version of the original ultraman, which if you feel like a quick easy ultraman to watch is perfectly fine

Both focus on teachers, have the same kind of special effects and sense of fun. If you are looking for a retro toku these are good choices

They have the same producer and other connection that you see when watching king-ohger. They are both fun shows

Both feature a lot of rider on rider fighting and explore similar themes of growing up with many character having their ideals challenged

Both gender change plots that explore how the change effects the romantic life of the main characters.