Get both!
If it were me, I'd save up and get both. I'm building a slow build RV-7 and at the time I ordered there was a six month backlog on QB kits, so I thought if I ordered a standard build and worked full time on it, I'd be at quick build stage within 6 months. How wrong I was. I'm a little slow, and OCD about things, so it took almost 12. Those QB kits are the best value for money you will ever find in in life, so if you want to get this thing flying years earlier, save up for a few more months and get a QB. I really think they understate how much time it saves for a first time builder. That said, if you're building purely for the sake of building, then sure, go the slow build, but I suspect that given you have asked the question, you probably are pretty keen to get this thing flying sooner than later. The upside to doing the slow build is that you can make more modifications if you so choose such as delux fuel caps, choose your own primer and a few mods in the fuselage. You will also develop far better metal working skills, but this all comes with a significant time cost.
Good luck.
Tom.