For some reasons i say ispeed.
One reason is not for coaster for itself but concerns the whole park.
ispeed was build after the demolition of sierra tonante, a crappy old school wodie without airtime, except for the final part, but it was the earliest park signature attraction. mirabilandia stated the retrack was too much expensive and build a brand new coaster was the best choice. The funnies thing is that two years later would have been built New Texas Giant. What a shame, if only sierra tonante had been a bit less battered maybe mirabilandia would have had an RMC.
The other reason is that ispeed is not Maverick brother but its dumb half-cousin. I know, Maverick was build earlier, so why would i say a newer coaster was born too early? Because, for my opinion, ispeed was designed under an "old" and dumb mentality. ispeed had the potential to be a top tier coaster but it was resized and made less intense to ensure the "highest number of possible guests", because "italians are not americans, they would run away if a coaster is too intense (maybe italians have a g force radar?)" and "if a coaster is only 10 meters higher maybe hundreds of visitors would flee (and 3 years later they made a taller water coaster and sold it as a family coaster, probably unintentionally, beacuse for months mirabilandia declared divertical was an "extreme" ride)", now we see a park in Poland with two hypercoasters that nearly double mirabilandia's revenue. These things look like jokes but are semi-official.