The argument as to the regime type that engenders more real output growth has featured prominently in many academic discourse for many decades now. Empirical submissions from many cross-country studies on this issue have been mixed. This country-specific, inter-temporal comparative study on Nigeria was undertaken to find out which regime type in the country can be adjudged to have recorded more real output growth than the other; and also to identify the macroeconomic variables that may be responsible for this outcome. Secondary data on the macroeconomic variables relevant to the study were collected and inferentially analysed. The Ordinary Least Squares (OLS) regression performed showed that the two regime types in the country did not record any growth in real output (RGDP) during the study period. The regression also showed that Real Gross Fixed Capital Formation (RGFCF) and the Literacy Rate (LTR) positively influenced RGDP growth. The Granger-causality regression performed revealed that there was neither a unidirectional nor a bidirectional (feedback) relationship between Democracy Index (D) and RGDP during the study period. The paper therefore recommended that governments in Nigeria must continue to formulate policies that promote economic democracy and also, interest groups and the civil society must continue to dialogue with governments to improve on spending on education so that RGFCF and LTR can continue to positively contribute to RGDP growth in the country irrespective of the stripe of the regime in power.