That would depend on how good your computer is, among other things. 1.7.10 is a bit more friendly on the ram usage. If you use the Twitch launcher you can also quite easily make a custom modpack with mods that interest you. If you however want a more tweaked pack, say so, I can probably find something of interest. A pack which is decently rounded and which you could use as a starting point is FTB Infinity Evolved in 1.7, or FTB Revelations in 1.12.