So do you think that it might be better to build a GPU rig and mine other cryptocurrencies instead of buying a dedicated hardware for bitcoin mining ?
The GPU rig is better and more profitable but you might need to baby sit it from time to time.
Bitcoin ASICs are just plug and play and you never have to worry about them. They also take up less space.
Never? Pfft. ASICS can overheat and break just as easily as a GPU can break in most instances; miners these days are especially susceptible to such issues as build quality goes down. Both need to be checked on occasionally. A well-built GPU rig can take up less space than a ASIC and has a higher resale value. There are also ways to put two GPUS on one PCI lane, which is slightly difficult to do but is possible.