How to properly use win32gui.ReleaseDC and what does it do (python, pywin32)?

I am new to this and I can't figure out which code is correct and fast? All options are working, but then I can’t understand the difference in behavior, please help me figure it out. How does win32gui.ReleaseDC work and is it necessary to use it if everything works without it? Whether to delete objects.

Examples of getting the color of a pixel:
Variant #1

def get_pixel_rgb_color(self, pos: Tuple[int, int]) -> Tuple[int, int, int]:
        rect = win32gui.GetWindowRect(self._hwnd)
        w = abs(rect[2] - rect[0])
        h = abs(rect[3] - rect[1])

        hwndDC = win32gui.GetWindowDC(self._hwnd)
        mfcDC = win32ui.CreateDCFromHandle(hwndDC)
        saveDC = mfcDC.CreateCompatibleDC()
        saveBitMap = win32ui.CreateBitmap()
        saveBitMap.CreateCompatibleBitmap(mfcDC, w, h)
        saveDC.SelectObject(saveBitMap)

        ret = win32gui.GetPixel(hwndDC, pos[0], pos[1])
        r, g, b = ret & 0xFF, (ret >> 8) & 0xFF, (ret >> 16) & 0xFF

        return r, g, b

Variant #2

def get_pixel_rgb_color(self, pos: Tuple[int, int]) -> Tuple[int, int, int]:
        hwndDC = win32gui.GetWindowDC(self._hwnd)

        ret = win32gui.GetPixel(hwndDC, pos[0], pos[1])
        r, g, b = ret & 0xFF, (ret >> 8) & 0xFF, (ret >> 16) & 0xFF

        return r, g, b

Examples of area screenshot:
Variant #1

def area_screenshot(self, start: Tuple[int, int], size: Tuple[int, int]) -> str:
        width, height = size[0], size[1]
        x_cord, y_cord = start[0], start[1]

        hwnd_dc = win32gui.GetWindowDC(self._hwnd)
        mfc_dc = win32ui.CreateDCFromHandle(hwnd_dc)
        dc_obj = mfc_dc.CreateCompatibleDC()
        bmp = win32ui.CreateBitmap()
        bmp.CreateCompatibleBitmap(mfc_dc, width, height)

        dc_obj.SelectObject(bmp)
        dc_obj.BitBlt(
            (0, 0), (width, height), mfc_dc, (x_cord, y_cord), win32con.SRCCOPY
        )

        signed_ints_arr = bmp.GetBitmapBits(True)
        bmp_arr = np.fromstring(signed_ints_arr, dtype=np.uint8)
        bmp_info = bmp.GetInfo()
        pil_im = Image.frombuffer(
            "RGB",
            (bmp_info["bmWidth"], bmp_info["bmHeight"]),
            bmp_arr,
            "raw",
            "BGRX",
            0,
            1,
        )
        buff = BytesIO()
        pil_im.save(buff, format="JPEG")
        img_b64 = b64encode(buff.getvalue()).decode("utf-8")

        mfc_dc.DeleteDC()
        dc_obj.DeleteDC()
        win32gui.ReleaseDC(self._hwnd, hwnd_dc)
        win32gui.DeleteObject(bmp.GetHandle())

        return img_b64

Variant #2

def area_screenshot(self, start: Tuple[int, int], size: Tuple[int, int]) -> str:
        width, height = size[0], size[1]
        x_cord, y_cord = start[0], start[1]

        hwnd_dc = win32gui.GetWindowDC(self._hwnd)
        mfc_dc = win32ui.CreateDCFromHandle(hwnd_dc)
        dc_obj = mfc_dc.CreateCompatibleDC()
        bmp = win32ui.CreateBitmap()
        bmp.CreateCompatibleBitmap(mfc_dc, width, height)

        dc_obj.SelectObject(bmp)
        dc_obj.BitBlt(
            (0, 0), (width, height), mfc_dc, (x_cord, y_cord), win32con.SRCCOPY
        )

        signed_ints_arr = bmp.GetBitmapBits(True)
        bmp_arr = np.fromstring(signed_ints_arr, dtype=np.uint8)
        bmp_info = bmp.GetInfo()
        pil_im = Image.frombuffer(
            "RGB",
            (bmp_info["bmWidth"], bmp_info["bmHeight"]),
            bmp_arr,
            "raw",
            "BGRX",
            0,
            1,
        )
        buff = BytesIO()
        pil_im.save(buff, format="JPEG")
        img_b64 = b64encode(buff.getvalue()).decode("utf-8")

        return img_b64