The EVE Priorities are:
1. CPU, as more cores you have as better, CPU is heart of your EVE, best of you could have Server/PC with dual sockets for e5-2680v4 !!!, you would be a king then
2. Fast HDD like SSD or SHDD, sill drastically improve performance, boot time of nodes, install nodes and running. Response time.
3. AND only then is RAM, you can have 256Gb RAM, but if your CPU will not hold nodes in the lab, your huge RAM becomes useless.
(It is myth, like I have 128Gb RAM and I am king, where your CPU has only 4 cores, it is usless)
PS: my server is DELL R630
dual CPU E5-2650v4 (24 physicals, 48 threads)
192GB RAM
4x2Tb SSD HDDs
Running ESXI 6.7 and till today I can carry all what I want, cleverly thinking of course.
EVE VM:
48 CPU (threads)
160GB RAM
2TB SSD
____________________________________________________

Use our EVE resource calculator to check your lab needs vs CPU and resource:
https://www.eve-ng.net/index.php/download/#CALC
regards,
Uldis