High efficiency is routinely reported in CH3NH3PbI3−xClx sensitized mesoscopic solar cells (PSCs) employing planar and scaffold architectures; however, a systematic comparison of their photovoltaic performance under similar experimental conditions and their long term stability have so far not been discussed. In this paper, we compare the performance and durability of PSCs employing these two device configurations and conclude that although a planar architecture routinely provides high initial photoconversion efficiency (PCE), particularly high open-circuit voltage (VOC), a scaffold is crucial to achieve long term durable performance of such devices. In a comparative study of scaffold (rutile nanorods, NRs) vs. planar devices, the efficiency in latter dropped off by one order of magnitude in ∼300 h despite their similar initial PCE of ∼12%. We compared the performance and the durability of two types of scaffolds, i.e., pristine and TiCl4 treated NRs, and observed that the pristine NRs showed >10% improvement in the PCE after ∼1300 h whereas the cells employing post-treated NR scaffold retained ∼60% of initial value. We address the origin of the different photovoltaic performance of planar and scaffold devices in the context of photoanode morphology and its possible effect on the cell durability. A planar architecture routinely provides high initial photoconversion efficiency however a scaffold is crucial to achieve long term durable performance of perovskite solar cells as the morphology and crystallinity of the electron transport layer have its significant affect on their long term operational stability. Display omitted •High efficiency perovskite solar cells with planar and scaffold architectures are developed.•The rutile nanorods devices reached a photoconversion efficiency ∼12.2%, a record for this type till date.•TiCl4 post-treatment of nanorod cells resulted in simultaneously increase of the JSC and VOC.•The long term performance of the planar and scaffold devices is compared for the first time.•Performance stability is related to crystallinity and chemical stability of the scaffold layer.