I think Bukele has more credibility than Biden. Biden was known to be senile and to have committed crimes. Bukele is known to have benefitted his country greatly.This is like saying you believe Joe Biden has all of his mental faculties until you see an official diagnosis from a doctor.
Abides by future elections? The opposition doesn't have chance, and its by design. Most dictators run this same playbook. Is Maduro a dictator? Is Putin a dictator?
He recently faced election in 2024 and won, which was already after he made the controversial choice to round up and imprison the gang members. He has a record of conducting fair elections, and has no record of abusing them. His way of running the country has already been validated by the voters.
It's understandable to suspect he might stifle the opposition in the future, in spite of his clean record. But as of now there's no track record of illegality like Biden had.
Also, I do not think Putin is a dictator. He has been elected and has the broad support of his nation. I think Maduro is a dictator. The Venezuelan elections were widely considered to be corrupt, and were not free and fair.