sandrix is right
but, you are asking the equivalent of what is the best car? it depends. A LOT more context is needed to provide a detailed answer
As a 5yr old computer can be fine, or you can bring a US$10K workstation to its knees, depending on workload.
As for no latency.. no bypassing basic laws of physics, and then ais free streaming services receiving video input, re-encoding, and globally distributing. Speed of light is NOT that fast. Live to viewing can easily be 15 seconds to a minute depending on a variety of factors dealing with viewership volume and network from streaming platform to viewer (ie nothing you can do anything about) . Want faster? don't use a free service
The issue with some laptops, especially consumer grade machines, is thermal throttling. a Laptop can be fine, it depends. For ex, a Dell mobile Precision m6800 (with NVENC GPU) worked fine for me (House of Worship, initial lockdown streaming). I tried to stream with a 2015/2016 gaming laptop with an Intel i5-6300HQ (2.3GHz 4c/4t circa Fall 2015), 8GB RAM, SATA SSD Win 10 Home edition, Nvidia GeForce GTX 960M and failed as the PC wasn't up to the task (no gaming, just alternating between USB webcam and simple pre-recorded videos, alongside a PPTx slide show window capture, streaming at 720p 30fps). The m6800 was overkill. With 3 years of OBS knowledge now, and no longer using the # of pre-recorded 4K content, I bet I could get that gaming laptop to work (but would require significant effort to optimize OS and OBS vs focusing on presentation/worship. so depends on budget)
To give you some context, and that your specs may be overkill???
For our House of Worship, with a single NDI PTZ camera (at the moment), and linked to house mic/audio system. Initially (lockdown) alternating between 4K pre-recorded content and live camera content. Now, all live (other than a walk-up video in 5 minute countdown timeframe before live service starts).
Though I'm annoyed at Intel for their over-promise, under-deliver (and grossly power inefficient CPUs), I could not an appropriate business class machine with AMD CPU and nVidia GPU in fall of 2020. I personally prefer HP's engineering over Dell, in general on enterprise class system (I skip consumer gear from all mfgs), but in this circumstance, the deal, config, etc... I went with next business day onsite service on a Dell (and most of my home systems are Dell as well, based on price):
OptiPlex 7080 Tower with 500W Power Supply (Platinum)
NVIDIA GeForce GTX 1660 Super, 6GB (DP/HDMI/DVI-D)
- To get Turing NVENC with GTX 1650 Super or higher.
- Today, I'd strongly consider a GPU that supports AV1 in hope of saving future install
Intel Core i7-10700K, 16 MB Cache, 8 Cores, 16 T, 3.8 GHz to 5.0 GHz, 125 W
Win 10 Pro 64 (I'd be inclined to avoid Win11, as too many glitches like WinME, Vista, 8, etc).
16GB DDR4 Memory
2.5 inch 1TB 7200rpm SATA Hard Disk Drive
- used for archiving video Recordings, I installed my own SSD for the OS drive as Dell's price was silly expensive
- I've since added another 4TB HDD as well. I offsite back 1TB of most recent videos to a cloud drive
DVD+/-RW
- to be able to burn DVD for folks if desired (ex Wedding, baptism, funeral, etc). optional, and some folks would argue against... depends on your 'audience'. I figure some elderly not necessarily going to figure out streaming, so DVD as alternative was nice fallback
This system has low CPU and GPU utilization for simultaneous Streaming (7K bitrate) and Recording (11GB file for 1h20m service) using separate settings (2 different encoding streams) at 1080p30. And this system is plenty capable to run a video editor (DaVinci Resolve) if/when desired to create video snippets
So, a recent, decent system is plenty powerful. Without knowing more, I'd say an i9 is probably overkill. Our system can handle additional NDI PTZ cameras without issue. And planning to install a digital audio workstation to optimize broadcast audio (we don't have a sound engineer, not that type of service)
