In the year 2049, teams of giant robots battle the field and race to the finish in the most popular sport in the world, the Immortal Grand Prix! The rookie Team Satomi thinks it has what it takes to win big and get the gold, but plenty of obstacles and opponents stand in the way. Amongst others,Team Black Egg has an invulnerable defense; Team Sledge Mamma plays dirty; and Team Velshtein is undefeatable. In the high stakes arena of the IGPX, can the hotshot Takeshi and his team of miscreants manage to win the ultimate fame and glory?
Both anime involve a racing competition in which the competitors race in mechs. Both are fun and enjoyable in their own ways. IGPX is much longer (thus, has better plot and character development). IGPX also is more recent (thus, has better animation). That said, if you like to see a combination of racing and mecha, then you will probably enjoy both.
Both anime are about racing leagues who use robots with wheels on their feet as their vehicles. (Apparently roller derby with giant robots is really big in the future.) The plot of each revolves around a team of low ranking racers who are struggling to beat larger, better supplied teams.