There are a lot of factors that I consider when choosing a base location.

I like to maintain a portal by the shrine to be able to change boss powers. So my starter base stays close to that.

Next I scout around to find a Black Forest location near a good size swamp with a few copper nodes close together near the shore. This lets you develop bronze in an area while setting up your iron production when you get that far.

Other things I look for are decent sized mountains and plains. If there is a small plains strip around the black forest and swamp that is ideal to me.

For silver I look for a good area in the black forest near the shore and on top of a copper node. Mountain needs to have stone golems or there won't be silver there. So you can scout areas out for silver even without the wishbone.

Copper tends to be a pain so I like to put bases on or near nodes of them to make forges etc. Shore in black forest is important for Tin.

One other factor is rare items like the Maypole. Only found one in a few seeds but I use it for the extra comfort and ended up putting my portal hub around it with a generic farm for carrots and turnips.

So I end up looking for combinations of biomes that are populated with resources I will need. This may take extra time to scout the map but I take a lot less time moving around ore by boat etc.