More RAM will always speed up your PC. It doesn’t hurt but it doesn’t always help. You can monitor your RAM usage and decide if you really need it. Spare RAM is used for caching, so if you are getting by with what you have, you don’t need to increase your cache RAM.
A CPU with more cores is always faster. Each core offers the opportunity to do more than one thing at a time. However, if you are doing a process with one thread, it will only use one core anyway. A faster 4-core CPU will run faster than an 8-core CPU in this scenario. This tells us the speed of the CPU can matter just as much as the cores.
64-bit software is always faster. Most of the newer CPUs are 64-bit, as well as the operating systems. A lot of the software you run is still 32-bit. It depends on the software and what is does to determine speed.
You always want a faster CPU and graphics card. Buying the fastest CPU and graphics card you can afford isn’t always the best idea. If you have a separate graphics card, your PC will use more power. A laptop may burn out the battery faster. If you don’t use your PC for gaming, you can opt for the slower CPU.
Macs are always more expensive than PCs. Yes Macs are more than lower end Windows PCs and Chromebooks but when you look at higher end PCs you will find the prices more comparable.
Building your own PC will always save you money. Years ago, maybe it would have but not now. Do the research. Buying the individual components can cost more. You may want to get your geek on and build one yourself but it won’t save you money.