Cutting tool geometry has a crucial effect on the machinability of hard-to-cut materials. These materials have low machinability that is mainly due to some inherent properties such as high strength which is maintained at elevated temperatures and low thermal conductivity. In this study, Ti-6Al-4V is used as a workpiece material and due to its low machinability, excessive tool wear, degenerate surface finish and high cutting forces may arise. A comprehensive experimental study is performed to evaluate two different carbide end mills, which have different cutting edge geometries to demonstrate their effects on tool wear, surface roughness, cutting forces. Furthermore, frequency response function (FRF) and modal parameters are extracted to evaluate their dynamic rigidity. The influence of vibrations on the surface finish is also investigated using measurements during cutting. Cutting tests are performed in chatter-free conditions to eliminate extreme tool wear, cutting forces and surface roughness. The test results are analyzed to arrive specific conclusions regarding the cutting tool geometries.