If you have the money, VKB Gunfighter 3 Stick base is fantastic, especially with an extension (a 20 cm curved extension comes with "Pro" or "Premium" options). You can swap cams and springs to get the feel you want. I have every compatible grip, which includes the Thrustmaster Warthog and Hornet grips with VKB adapters installed in place of their normal base connector.
https://vkbcontrollers.com/?product_cat=vkb-joysticks-and-ruddersThe most capable grip in terms of buttons, triggers, and analog axes is the Modern Combat Grip (MCG) Pro. It is styled and arranged similar to Russian fighter jets, which is great for flying the MiG-21bis, MiG-29, Su-27, and Su-33 in DCS. But I find the control arrangement a little awkward/uncomfortable. The grip itself is also a little smaller than what feels comfortable to me, but is does have a "checkered diamond" texture on the side. The vast number of hats, buttons, switches, and analog axes make this grip the best choice if you want to map as much as possible to your grip.
If you prefer the shape, feel, and arrangement of US style grips, the Space Combat Grip (SCG) Pro is a better option. It is somewhere between the Warthog and Hornet grips in control arrangement. Compared to the MCG Pro, it swaps the brake lever for a twist rudder axis, loses a couple of fire buttons, and loses the right side hat for a single button (the analog joystick hat can be swapped out with a regular hat switch or programmed to act like a hat switch), which is still able to fully support US fighter grips button maps like the Warthog and Hornet grips. The grip itself is larger and shaped more like a pistol grip with finger grooves and some texturing, which is very comfortable. I miss having the side hat available for extra button mapping, but otherwise like this grip a lot better for me than the MCG Pro when I am not flying Russian jet fighters.
For WW2 Luftwaffe fans, there is the KG-12 grip which is a reasonable facsimile for the standard shape/size grip for German fighters. But if you want a useful number of buttons and hats, this I is not the grip for you. The hat switch that looks like a fire button doesn't even have a center press function unlike all of the hats on the MCG and SCG grips. It also lacks any kind of texture unlike the real KG series grips. The flip down trigger/safety is nifty, though it doesn't have a switch to sense when it is flipped up or down (unlike the MCG Pro). I like using it when flying the Bf109 and Fw190s in VR. There is nothing better than seeing and feeling the same shape/control arrangement, especially if the stick controls are animated so you see them move when you press them.
The grips below are (from left to right): VKB SCG Premium, VKB MCG Pro, VKB F-14, TM Warthog, TM Hornet, VKB KG-12
