I suggest getting a commercial speaker first. Build a DIY speaker second because it’ll tie up considerable time, effort, planning, money, etc. BTW, if you don’t have the proper tools, like table saws, don’t waste your time, unless you’re fine with rough looking cabinets.
The virtues of building speakers is that you can voice the speakers like fine instruments to your liking. Certain MP Caps work well with different cone materials and to a lesser degree coils. For example, Mundorf Supremes work well with paper cones. Topology, drivers, cones, enclosures, porting, damping, etc. all contribute to the sound, and with DIY, you’re in control of these parameters, whereas a commercial speaker, you’re stuck with lowest-cost-to-produce mentality.
Good Luck!