always good to mix sessions up,if possible, though in reality, indoor (when everyone wants a bat and you may be limited to 20 mins like I was on sunday), it may give you time only to focus on one thing at a time.
So think about what it is you want?do you want to face bowlers? if so, maybe a net against them and then 30 throw downs grooving a shot eg on drive.
Do you want to reassess your technique/is there something really wrong? in this case facing bowlers isnt ideal as the coach will have to stop the net and discuss verious things with you- throw downs, sidearm/ bola machine are better for this I feel.
Or do you want to add more shots to you armoury? Again throw downs, even underarms with a tenn is ball practising sweep reverse sweep slop sweep, or short bowlers fired at you with a tennis racket can be good.
personally, I am looking at my game and thinking, what should I be doing to improve it? just turning up and facing bowler week after week wont help me improve, i dont think, as I have some technical issues to address.
For example; My bat face is closing on impact- I want to grove my sots 'through the v', via throw downs and machine, then bowlers.
I need to improve on the short ball, im blocking too many half trackers- need to pick up length quicker and get into position quicke- will work on hand eye coordination with teenis ball and racket, then thrown downs, then bola machine- How quick a bumper can I face and still smash it, whilst having it under control??
Finally, I want to work on my sweep, maybe add a reverse to the armoury, and improve my hitting over the top.
make sure that you are getting what you want from practice, im sure you can find a mate who is up for throw downs, as some people like to turn up and 'just have a net!'